Use of since and for:
Since and for are two words that are used for similar, but not exactly the same, purposes.Since:
- It gives the starting point of actions, events or states, continuing until the present.
- It refers to when things began.
- It can only be used with the perfect tenses.
Since + a point in time (in the past) until now.
- I've been waiting since 7 o'clock.
- I have known him since January.
- I have been here since 5 o'clock and I am getting tired.
- It has been three years since the last earthquake.
For:
- We use For when we measure the duration
- When we say how long something lasts.
- We can use all verb tenses with For.
For + a period of time.
- I have known her for a long time.
- I lived here for ten years and then moved to another place.
- They are exercising for three hours today.
For vs. Since
Knowing when to use FOR and when to use SINCE is important.
FOR is used to mention a specific period (or duration) of time | SINCE is used to mention the starting point of a period of time (continues to now) |
I have been a doctor for fifteen years. (duration = 15 years) | I have been a doctor since 1992. (starting point = 1992) |
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