B) Use PRESENT PERFECT TENSE after BECAUSE:
Example: She can't go to the party. (catch a cold)
She can't go to the party because she has caught a cold,
1. He can't walk very fast. (hurt / leg)
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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)
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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 don'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)
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