№1 The concert starts at nine o'clock. Do you want to go to a cafe after him?№2 We're going to go to the movies tomorrow night. why do not you join us?
№3 Someone is standing at the door. I'll go and see who it is.
№4 I promise that I will help with the task!
№5 Look where you're going! you're going to fall!
Используется Perfect потому что это твой личный опыт, а если смущает слово before , то предложение переводиться просто как :я здесь уже был
1. permission
2.laughter
3.Spanish
4.violence
5.believes
6. marriage
7. variety
8. boredom
9. cheerfully
10. equality
11.length
12.receiver
13. owner
14.entrance
15.mathematicians
16.generosity
17.division
18.majority
19.membership
20.cookery
Воот;)