Use present prefect tense after because
1. he can't walk very fast (hurt/leg)
2. I can't get in (lose/key)
3. I know this story very well (see the film)
4. I can't post the letter (not put/stamp /on it )
5. He can't stand up (eat too much)
6. They can't go on holiday (not save/money)
7. I know him (meet him before)
8. We won't know how he is (not hear from him)
9. He won't take a cigarette (give up smoking)
10. She can't get in (he/lock the door)
I can't get in because I have lost the key. I known this story very well because I have already seen this film. I can't posted the letter because I have not put stamp on it. He can't stand up because he has eat too much. He can't stand up because he has eat too much. They can't go on holiday because they haven't saved money. I know him because I have met him before.
8. We don't know how he is because we haven’t heard from him.
9 He won't take a cigarette because he has given up smoking.
10 She can't get in because he has locked the door
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