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Why Learners Confuse Since and For
Both since and for talk about time and duration.
Both are extremely common in Present Perfect sentences.
But they answer two completely different questions:
- Since → When did it start?
- For → How long did it last?
Understanding this difference removes the confusion instantly.
Since — The Starting Point
We use since to show the moment something began.
Examples:
- I have lived here since 2018.
- She has worked here since Monday.
- We have known each other since childhood.
👉 Since = the starting point in time.
It answers the question:
“Since when?”
For — The Duration
We use for to describe the length of time something has lasted.
Examples:
- I have lived here for five years.
- She has worked here for two weeks.
- We talked for hours.
👉 For = the duration of time.
It answers the question:
“For how long?”
Quick Comparison
| Word | Focus | Question |
|---|---|---|
| since | starting point | since when? |
| for | duration | for how long? |
Side-by-Side Examples
- I have studied English since 2020.
- I have studied English for four years.
Same idea.
Different time perspective.
Mini Quiz
- I have lived here ___ 2015.
→ since - We have been friends ___ many years.
→ for - She has studied German ___ three months.
→ for - He has worked here ___ Monday.
→ since
Common Mistakes
❌ I have lived here since five years.
✔️ I have lived here for five years.
❌ She worked here for 2019.
✔️ She worked here since 2019.
❌ We know each other for 2010.
✔️ We know each other since 2010.
FAQ
Can “since” be used with Past Simple?
Yes. Example:
I moved here in 2018 and have lived here since.
Is “for” only used with Present Perfect?
No.
It can appear in many tenses.
Example:
We talked for two hours.
Can both appear in one sentence?
Yes:
I have lived here since 2018 for almost seven years.
Final Logic (No Memorizing)
If you remember only this, you will never confuse them again:
- Since → starting point
- For → duration
Two different perspectives on time.
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© Author’s concept by Tymur Levitin
Founder and Director — Levitin Language School