Задайте вопросы к каждому члену предложения. 1. american high school students like to use computers. 2. the man with the magazine in his hands is standing next to the counter. 3. the boy is playing in front of his parents. 4. we are taught science and biology. 5. the train will leave at 1: 35 p.m.
Since Facebook, MySpace or Bebo appeared, they have become a great way for young people to keep in touch with friends. There are things, however, you should do to stay safe and protect yourselves. First, if you do not want to use your real name, you may invent a nickname. Also, most sites ask you to provide them with an email address: use any address to avoid spam or unwanted guests. Feel free to write lots of interesting things in your online profile, but never ever put real house address or existing phone numbers. In fact, don't give any information that potentially could let strangers know your identity, because on the Internet you never know who is looking.
/тут что-то пропущено/ If you fail to protect their personal data, you will put your friends in danger in the future. So the general massage is: have fun, but take care.
2. Whatever you do, you mustn't touch that switch. It`s very dangerous.
3. You mustn't forget what I told you. It`s very important.
4. We don't have to leave yet. We`ve got plenty of time.
5. Ann was feeling ill last night. She had to leave the party early.
6. I had to go to the bank yesterday to get some money.
7. The windows are very dirty. I must clean them.
8. The windows aren`t dirty. You don't have to clean them.
9. We arrived home very late last night. We had to wait half an hour for a taxi.
10. These cakes are very nice. You must have one.
11. We don't have to take an umbrella. It`s not going to rain.