Do you ever find yourself hesitating between “since” and “for”? What about “during” and “while”? Or “at,” “on,” and “in”?
You’re not alone! Prepositions are one of the most challenging areas of English grammar—even for advanced learners.
The good news? Once you understand a few simple rules, you’ll never make these mistakes again.
In this comprehensive guide, you’ll learn:
- ✅ The difference between since and for
- ✅ The difference between during and while
- ✅ The difference between at, on, and in
- ✅ PLENTY of examples for each preposition
- ✅ A practice quiz to test yourself
- ✅ Real-life conversation scenarios
Let’s dive in!
Part 1: The Grammar Challenge Quiz
Before we dive into the rules, test yourself with these common preposition questions.
Question 1: Since vs. For
“I’ve lived here _______ two years.”
Answer: for — “For” is used with periods of time. (Two years = a period of time)
Question 2: At, On, or In
“See you _______ Friday.”
Answer: on — “On” is used with specific days of the week.
Question 3: During vs. While
“I was busy _______ the day.”
Answer: during — “During” is followed by a noun (the day).
Question 4: At, On, or In
“We could meet _______ three o’clock.”
Answer: at — “At” is used with specific times.
Question 5: Since vs. For
“She’s worked here _______ 2018.”
Answer: since — “Since” is used with a point in time (2018).
Question 6: During vs. While
“The phone rang _______ we were sleeping.”
Answer: while — “While” is followed by a clause with a verb (we were sleeping).
Question 7: At, On, or In
“The conference is _______ July.”
Answer: in — “In” is used with months and longer periods.
Part 2: Since vs. For
The Core Difference
| Preposition | Usage | Example |
|---|---|---|
| Since | + Point in time (specific moment) | “since 9 o’clock,” “since March,” “since 1995” |
| For | + Period of time (duration) | “for 5 minutes,” “for 5 decades,” “for two years” |
Since = Point in Time
The Rule: Use “since” when you mention a specific starting point in time.
Examples:
- “I’ve lived here since 2018.” (Starting point: 2018)
- “She’s worked here since March.” (Starting point: March)
- “I’ve been waiting since 9 o’clock.” (Starting point: 9 AM)
- “They’ve been married since 2010.” (Starting point: 2010)
More Examples:
- “I’ve known her since we were children.”
- “He’s been on vacation since Friday.”
- “I’ve been studying English since 2020.”
- “The store has been open since 8 AM.”
- “She’s been a teacher since she graduated.”
For = Period of Time
The Rule: Use “for” when you mention a duration or length of time.
Examples:
- “I’ve lived here for two years.” (Duration: two years)
- “She’s worked here for six months.” (Duration: six months)
- “I’ve been waiting for an hour.” (Duration: one hour)
- “They’ve been married for 15 years.” (Duration: 15 years)
More Examples:
- “I’ve known her for 10 years.”
- “He’s been on vacation for a week.”
- “I’ve been studying English for three years.”
- “The store has been open for two hours.”
- “She’s been a teacher for 20 years.”
Quick Comparison
| Since (Point in Time) | For (Period of Time) |
|---|---|
| since 9 AM | for 2 hours |
| since Monday | for 3 days |
| since March | for 6 months |
| since 2018 | for 5 years |
| since childhood | for decades |
Memory Trick:
- Since = Starting point (“When did it start?”)
- For = Duration (“How long has it been?”)
Part 3: During vs. While
The Core Difference
| Preposition | Usage | Example |
|---|---|---|
| During | + Noun | “during the week,” “during the meeting” |
| While | + Verb / Clause | “while watching TV,” “while we were sleeping” |
During = Followed by a Noun
The Rule: Use “during” when you mention a noun (a period, event, or activity).
Examples:
- “I was busy during the day.” (Noun: the day)
- “The phone rang during the meeting.” (Noun: the meeting)
- “He fell asleep during the movie.” (Noun: the movie)
- “I exercise during the week.” (Noun: the week)
More Examples:
- “She called during the break.”
- “The delivery arrived during the lunch hour.”
- “I always drink coffee during the morning.”
- “They visited us during the holidays.”
- “He made a lot of progress during the course.”
While = Followed by a Verb/Clause
The Rule: Use “while” when you mention a clause with a verb (someone doing something).
Examples:
- “The phone rang while we were sleeping.” (Clause: we were sleeping)
- “I read the newspaper while I was eating breakfast.” (Clause: I was eating)
- “She listens to music while she works.” (Clause: she works)
- “I don’t text while I’m driving.” (Clause: I’m driving)
More Examples:
- “He fell asleep while he was reading.”
- “She called while I was in the shower.”
- “I always drink coffee while I’m working.”
- “They visited us while we were on vacation.”
- “He made progress while he was taking the course.”
Quick Comparison
| During + Noun | While + Verb/Clause |
|---|---|
| during the day | while I was working |
| during the meeting | while we were talking |
| during the movie | while she was sleeping |
| during the week | while they were eating |
| during the summer | while I was traveling |
Memory Trick:
- During = + noun (a thing)
- While = + verb (an action)
“While” with -ing Forms
In informal English, you can use “while” with a verb in the -ing form.
Examples:
- “I read the newspaper while eating breakfast.”
- “He fell asleep while reading.”
- “She listens to music while working.”
Note: This is a shortened form of “while I was eating,” “while he was reading,” etc.
Part 4: At, On, In (Time)
The Core Difference
| Preposition | Usage | Example |
|---|---|---|
| At | Specific, precise times | “at 3 o’clock,” “at midnight” |
| On | A single day or date | “on Sunday,” “on January 31st” |
| In | Anything longer than one day | “in July,” “in 2012,” “in the summer” |
At = Specific Times
The Rule: Use “at” for specific, precise times.
Examples:
- “We could meet at three o’clock.”
- “I wake up at 6 AM.”
- “The movie starts at 8:30.”
- “She arrived at noon.”
- “He left at midnight.”
More Examples:
- “The store closes at 9 PM.”
- “I have a meeting at 2:30.”
- “She called at exactly 5 o’clock.”
- “The train arrives at 10:15.”
- “We’ll have dinner at 7.”
On = Days and Dates
The Rule: Use “on” for specific days or dates.
Examples:
- “See you on Friday.”
- “She was born on January 31st.”
- “We’re leaving on Monday morning.”
- “He arrived on Christmas Day.”
- “I have a meeting on the 15th.”
More Examples:
- “I’ll see you on Sunday.”
- “We met on Valentine’s Day.”
- “She starts her new job on June 1st.”
- “He called me on Tuesday.”
- “We’re having a party on Saturday night.”
In = Longer Periods
The Rule: Use “in” for months, years, seasons, and any period longer than one day.
Examples:
- “The conference is in July.”
- “She graduated in 2012.”
- “We usually travel in the summer.”
- “He was born in the 1990s.”
- “I’ll finish the project in three weeks.”
More Examples:
- “I was born in December.”
- “She visited us in 2018.”
- “We go skiing in the winter.”
- “He started his business in the spring.”
- “I’ll call you in an hour.”
Quick Comparison: At, On, In
| At (Specific Times) | On (Days/Dates) | In (Longer Periods) |
|---|---|---|
| at 3 o’clock | on Friday | in July |
| at 8 AM | on January 31st | in 2012 |
| at noon | on Christmas Day | in the summer |
| at midnight | on Monday morning | in the 1990s |
| at 5:30 | on the 15th | in three weeks |
Part 5: Summary of All Prepositions
| Preposition Pair | Rule | Example |
|---|---|---|
| Since vs. For | Since + Point in time / For + Period | “since 2018” / “for two years” |
| During vs. While | During + Noun / While + Verb | “during the day” / “while sleeping” |
| At vs. On vs. In | At + Specific times / On + Days / In + Longer periods | “at 3 PM” / “on Friday” / “in July” |
Part 6: Practice Quiz – Test Yourself!
Choose the correct preposition for each sentence.
1. “I’ve lived here _______ two years.”
(since / for)
Answer: for — “Two years” is a period of time.
2. “See you _______ Friday.”
(at / on / in)
Answer: on — “Friday” is a specific day.
3. “I was busy _______ the day.”
(during / while)
Answer: during — “The day” is a noun.
4. “We could meet _______ three o’clock.”
(at / on / in)
Answer: at — “Three o’clock” is a specific time.
5. “She’s worked here _______ 2018.”
(since / for)
Answer: since — “2018” is a point in time.
6. “The phone rang _______ we were sleeping.”
(during / while)
Answer: while — “We were sleeping” is a clause with a verb.
7. “The conference is _______ July.”
(at / on / in)
Answer: in — “July” is a month (longer than one day).
8. “I’ve been waiting _______ an hour.”
(since / for)
Answer: for — “An hour” is a period of time.
9. “He fell asleep _______ the movie.”
(during / while)
Answer: during — “The movie” is a noun.
10. “She was born _______ March 15th.”
(at / on / in)
Answer: on — March 15th is a specific date.
11. “They’ve been married _______ 2010.”
(since / for)
Answer: since — “2010” is a point in time.
12. “I read the newspaper _______ eating breakfast.”
(during / while)
Answer: while — “Eating” is a verb form.
13. “We’re leaving _______ Monday.”
(at / on / in)
Answer: on — “Monday” is a specific day.
14. “I always drink coffee _______ the morning.”
(at / on / in)
Answer: in — “The morning” is a period longer than one day.
15. “He called me _______ 5 o’clock.”
(at / on / in)
Answer: at — “5 o’clock” is a specific time.
Part 7: Real-Life Conversation Examples
Example 1: At Work
Manager: “I’ve worked here for 10 years, since 2014 actually.”
Employee: “I’ve only been here for two months.”
Manager: “We’ll have a team meeting at 3 PM on Friday.”
Employee: “Will you be busy during the meeting?”
Manager: “No, I’ll be free. I can review the report while you’re presenting.”
Example 2: Travel Planning
Traveler 1: “When are you leaving?”
Traveler 2: “We’re leaving on Saturday morning.”
Traveler 1: “When do you arrive?”
Traveler 2: “We arrive at 5 PM in the afternoon.”
Traveler 1: “Will you stay for two weeks?”
Traveler 2: “Yes, since we have time off work.”
Example 3: At Home
Parent: “The kids have been asleep since 8 PM.”
Child: “I was busy during the day.”
Parent: “I know. You were studying while I was cooking.”
Child: “I’ll wake up at 7 AM on Sunday.”
Parent: “We’ll have breakfast in the morning.”
Example 4: Social Plans
Friend 1: “Let’s meet at 7 PM on Friday.”
Friend 2: “I can’t. I’m busy during the evening.”
Friend 1: “What about Saturday?”
Friend 2: “I’m free in the afternoon.”
Friend 1: “Great. I’ll call you at 2 PM.”
Example 5: Health & Lifestyle
Doctor: “You should rest for at least a week.”
Patient: “I’ve been feeling tired since last month.”
Doctor: “You need to eat better during the day.”
Patient: “I know. I often skip meals while I’m working.”
Doctor: “Try to take breaks during your workday.”
Part 8: Common Mistakes to Avoid
Mistake 1: Using “Since” with a Period of Time
❌ Incorrect: “I’ve lived here since two years.”
✅ Correct: “I’ve lived here for two years.”
Why? “Two years” is a period of time. Use “for” for periods.
Mistake 2: Using “For” with a Point in Time
❌ Incorrect: “I’ve lived here for 2018.”
✅ Correct: “I’ve lived here since 2018.”
Why? “2018” is a point in time. Use “since” for points.
Mistake 3: Using “During” with a Verb
❌ Incorrect: “The phone rang during we were sleeping.”
✅ Correct: “The phone rang while we were sleeping.”
Why? “We were sleeping” is a clause with a verb. Use “while.”
Mistake 4: Using “While” with a Noun
❌ Incorrect: “I was busy while the day.”
✅ Correct: “I was busy during the day.”
Why? “The day” is a noun. Use “during” with nouns.
Mistake 5: Confusing “At,” “On,” and “In”
❌ Incorrect: “I have a meeting at Friday.”
✅ Correct: “I have a meeting on Friday.”
❌ Incorrect: “I was born in 3 o’clock.”
✅ Correct: “I was born at 3 o’clock.”
❌ Incorrect: “The conference is on July.”
✅ Correct: “The conference is in July.”
Part 9: Quick Reference Cheat Sheet
| Preposition | Rule | Examples |
|---|---|---|
| Since | + Point in time | since 9 AM, since March, since 2018 |
| For | + Period of time | for 2 hours, for 3 days, for 5 years |
| During | + Noun | during the day, during the meeting |
| While | + Verb/Clause | while sleeping, while we were sleeping |
| At | + Specific times | at 3 o’clock, at noon, at midnight |
| On | + Days/Dates | on Friday, on January 31st |
| In | + Longer periods | in July, in 2012, in the summer |
Final Summary
| Concept | Key Point |
|---|---|
| Since vs. For | Since = Point in time / For = Period of time |
| During vs. While | During = Noun / While = Verb/Clause |
| At vs. On vs. In | At = Specific times / On = Days / In = Longer periods |
| Common Mistake 1 | Don’t use “since” with periods of time |
| Common Mistake 2 | Don’t use “during” with verbs/clauses |
| Common Mistake 3 | Don’t confuse “at,” “on,” and “in” for time |
Put Your Skills Into Practice
Now that you’ve mastered these prepositions, it’s time to practice!
Your Challenge: Write 8 sentences in the comments below:
- 2 using “since” and “for”
- 2 using “during” and “while”
- 4 using “at,” “on,” and “in”
Example:
- “I’ve lived here since 2018.”
- “I’ve lived here for two years.”
- “I was busy during the day.”
- “I read while I was eating breakfast.”
- “We could meet at 3 o’clock.”
- “See you on Friday.”
- “The conference is in July.”
- “I was born on January 15th.”
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Which of these preposition rules was most helpful for you? Share in the comments below—I’d love to hear from you!
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