How to Use For and Since with Time Rules Examples and Differences
| Expression | Used For | Example |
|---|---|---|
| for | Period or duration of time | He has lived here for five years. |
| since | Point or starting moment in time | He has lived here since 2019. |
Core Rules for For and Since for Time
The prepositions "for" and "since" show time in English, but are used differently. "For" tells us the length or period of time, while "since" points to the time when something began. Both often appear in the present perfect or present perfect continuous tense.
- Use "for" with a period (minutes, hours, years, days, months, a long time).
- Use "since" with a fixed point in time (Monday, 4 PM, 2005, last week).
- Both help describe actions or states continuing up to now.
- "For" fits past, present, or future; "since" is used when the action starts in the past and continues.
Difference Between For and Since in Time
Use "for" to show the amount of time something happens (duration). Use "since" to show when something started (starting point). For is for periods; since is for points in time.
| Word | Use With | Example Sentence |
|---|---|---|
| for | Period of time (duration) | She has been waiting for two hours. |
| since | Point in time (when it started) | She has been waiting since 10 AM. |
| for | Days, months, years, weeks | They lived in Delhi for ten years. |
| since | Dates, times, events, exact points | They lived in Delhi since 2012. |
Examples and Practice Exercises
Practicing with sentences helps you use for and since correctly in all situations. Try filling in the blanks and check your answers to build confidence for exams and writing.
- I have known him _______ five years. (for)
- She has been in the library _______ 2 o'clock. (since)
- They have studied _______ a long time. (for)
- She has worked here _______ March. (since)
- He has been feeling ill _______ Monday. (since)
Check: Use "for" when expressing the entire length; use "since" when focusing on when it started.
Common Mistakes with For and Since
- Incorrect: I have been living here since ten years.
Correct: I have been living here for ten years. - Incorrect: He has studied for 2018.
Correct: He has studied since 2018. - Incorrect: She has worked here for last week.
Correct: She has worked here since last week. - Incorrect: We've known each other since ages.
Correct: We've known each other for ages.
Remember: "Since" never goes with durations, and "for" never goes with fixed times or dates.
Quick Reference Timeline: For vs. Since in English
A simple way to remember: Use "for" when you talk about "how long"; use "since" when you talk about "when it began."
| Type | Timeline | Example |
|---|---|---|
| for | Start → (length of time) → End/Now | for six months, for an hour, for years |
| since | Start Point (date/time) → ... → Now | since morning, since last year, since 2015 |
Mini Quiz: For or Since?
- We have lived here _______ 2009. (since)
- I haven't seen her _______ three days. (for)
- The shop has been closed _______ Friday. (since)
- She’s been a teacher _______ ten years. (for)
- He has slept _______ eight hours. (for)
At Vedantu, we make English grammar easy with step-by-step rules and clear examples. Learning the correct use of for and since for time helps you avoid mistakes in writing, speaking, and exams. These rules help you talk about duration and starting points with confidence. For more help, check Vedantu’s grammar topic pages and worksheets.
To understand more about prepositions of time, explore Prepositions of Time and Tenses on Vedantu. Practice will make you fluent and accurate in English.
Summary: “For and since for time” are important for building strong English sentences. Use “for” with durations and “since” with start points. This difference helps you express time correctly in schoolwork, conversation, and exams, and prevents common grammar errors.
FAQs on For and Since for Time Expressions in English
1. What is the difference between for and since for time?
The main difference is that for is used to show a duration of time, while since is used to show the starting point of an action.
- Use for + period of time: for two hours, for a week, for a long time.
- Use since + specific point in time: since 2020, since Monday, since 8 a.m..
- Example: I have lived here for five years. / I have lived here since 2019.
2. How do you use for in present perfect tense?
In the present perfect tense, for is used to show how long an action has continued.
- Structure: Subject + has/have + past participle + for + period of time
- Example: She has worked here for three years.
- It answers the question: How long?
3. How do you use since in present perfect tense?
In the present perfect tense, since is used to indicate the exact time when an action started.
- Structure: Subject + has/have + past participle + since + point in time
- Example: They have been friends since childhood.
- It answers the question: Since when?
4. Can you use for and since with past tense?
Yes, for can be used with the past tense, but since is rarely used alone in simple past without a perfect tense.
- Correct: I lived there for two years.
- Less common: I lived there since 2018 (more natural: I have lived there since 2018).
- Since is most commonly used with present perfect or past perfect.
5. What are common time expressions used with for?
Common time expressions with for include periods or durations of time.
- for two minutes
- for a week
- for several years
- for a long time
- for ages
6. What are common time expressions used with since?
Common time expressions with since include specific points in time.
- since 2010
- since Monday
- since January
- since 9 o’clock
- since last year
7. Can you give example sentences using for and since?
Yes, for is used with a duration, and since is used with a starting point in time.
- I have studied English for five years.
- I have studied English since 2021.
- She has been tired for two days.
- She has been tired since Monday.
8. What is a common mistake when using for and since?
A common mistake is using since with a duration instead of a starting point.
- Incorrect: I have lived here since five years.
- Correct: I have lived here for five years.
- Remember: for = duration, since = starting point.
9. Can since be used as a conjunction?
Yes, since can function as a conjunction meaning “because” or referring to time.
- Time meaning: I have been happier since I changed jobs.
- Reason meaning: Since it was raining, we stayed home.
- In time clauses, it connects a starting point to the present.
10. Is it correct to use for and since with continuous tenses?
Yes, for and since are commonly used with present perfect continuous to show duration or starting time.
- Structure: Subject + has/have been + verb-ing + for/since
- Example with for: She has been reading for two hours.
- Example with since: She has been reading since 3 p.m.
