Заполните пропуски словами can, can't, could, couldn't, to be able to

1. I'm afraid I_______help you at the moment.
2. I don't think I'll_______come to the meeting.
3. The negotiations broke down because we_______agree on the price.
4. I_______see you were having problems, so I didn't interrupt.
5. If you_______make a firm order today, we should_______ship by Friday.
6. I find Portuguese very difficult I _______ understand it, but I_______speak it.
7. Sorry, I_______see you next week, but I might_______make the week after.
8. A: Will you_______go to the training seminar?
В: No, I_______- I'm very busy.
9. I'm sorry I_______come to your talk yesterday I had to sort out a problem.
10. I_______ski really well when I was in my twenties, but now I'm out of practice.

1)cant2)be able3)couldnt4)could5)Can, be able to 6)Couldnt, could(was able to)7)wouldnt be able to(cant), be able to8)be able to9)couldnt10)could