Ответ:
2.1. I'll wait here until you get back.
2. Give me a ring when you hear some news.
3. After the TV programme ends, I'll do my homework.
4. Before I go to work, I'll have a bath.
5. While she's in Paris, she'll visit friends.
6. As soon as the lesson ends, I'll go home.
7. I won't leave the house until the postman calls.
8. Can you feed the cats while I'm away?
9. I'll tell you about the holiday when I get back.
10.I'll study English until I speak it perfectly.
По правилам английской грамматики в придаточных предложениях времени и условия с союзами if,when, as soon as, until, before, after, whenever, unless и др. вместо будущего времени употребляется соответствующее настоящее время.
3.1 Before you leave, don’t forget to shut the windows.
2.I'll phone you as soon as I arrive in London.
3. Please don’t touch anything before the police come.
4. Everyone will be very surprised if he passes the exams.
Объяснение: