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Ответ:

1. i need help with my homework, I usually ask my sister.

2.I don't come to Bill's party next Saturday unies he invites me.

3. If you came to the concert with us, you would have enjoyed it .

4. I will be very excited if i met an alien.

5.How will you feel if you won the match tomorrow?

6. I haven't called Jane if i had known she was ill.

7.Be careful You'll hurt yourself if you fell

8.Which planet will you visit if you were an astronaut?

9. If you had come to the party you will meet Andrew.

10. Uniess you study you won't get in into university.