We use since with the starting point. Examples: since January, since Monday, since last year.
We use for with a period of time. Examples: for two hours, for weeks, for ages.
In negative sentences, we can use in and for with the same meaning.
Fill in the blanks with for, since or in.
1I haven't seen him ............... months.
Select 2 answers.
Wrong!
In negative sentences, we can use for or in to indicate duration.
2He has been absent ............... several days.
Wrong!
3They have lived ............... their life here.
Wrong!
We do not use for with all.
4This has been going on ............... several months.
Wrong!
5He has been unwell ............... he moved to the city.
Wrong!
6Have you been waiting ............... long?
Wrong!
7It hasn't rained ............... months.
Wrong!
8I have known him ............... a long time.
Wrong!
9We have known each other ............... our childhood.
Wrong!
10I haven't been to the theatre ............... ages.
Wrong!
11She has been acting ............... she was three.
Wrong!
12I have been teaching English ............... twenty years.
Wrong!
Done.
Score: 0/12
Answers
- I haven’t seen him in/for months.
- He has been absent for several days.
- They have lived all their life here.
- This has been going on for several months.
- He has been unwell since he moved to the city.
- Have you been waiting for long?
- It hasn’t rained Either could be used here months.
- I have known him for a long time.
- We have known each other since our childhood.
- I haven’t been to the theatre Either could be used here ages.
- She has been acting since she was three.
- I have been teaching English for twenty years.

