1. It's time to go home./to play computer games./ for school.
是回家/玩电子游戏/上学的时候了。
2. It's bad for you to spit on the ground. 随地吐痰不好。
Smoking is bad for your health. 抽烟不利于你的健康。
Too many sweets are bad for your teeth. 吃过多的糖对你的牙齿有害。
3. It took me half an hour to fall asleep last night. 昨天夜里我花了半个小时才入睡。
4. You'd better put away all your clothes./go over your homework again./ read more books.
你最好把你的衣服收好/再检查一遍你的作业/多读几本书。
You'd better not go until your aunt arrives. 你最好等你的姨妈到了以后再走。
5. What's wrong with the animal? 这动物怎么啦？
6. Before the operation he used to have a headache. 在未动手术之前，他以前经常头痛。
I used to go hiking when I was young. 我年轻时经常外出徒步旅行。
7. I'd like to go there on foot. / by bus. 我愿意步行/坐公共汽车到那儿去。
Would you like him to make a phone call to you? 您愿意他打电话给您么？
8. I can't wait to pack my bag. 我等不及打我的包了。
9. Let's hurry so that we can get there before supper. 让我们抓紧时间，这样才能在晚饭前赶到那里。
My father lives so far away that we hardly see him. 我父亲住在很远的地方，所以我们难得见到他。
I bought a boat so that I could go fishing. 我买了一条船，这样我就可以去钓鱼了。（过去时）
10. The harder you work, the higher marks you'll get. 你学习越努力，你的成绩就越好。
11. Don't be late for the concert. 去听音乐会可别迟到了。
12. It's said that he gets on well with others. 据说他和别人相处的很好。
13. He enjoys reading in bed. 他躺在床上津津有味地看书。
She kept on working although she was tired. 她虽然累了，但仍然继续工作。
They are busy getting ready for the party. 他们正忙着为聚会作准备。
14. He often tells me not to play a joke on the old people. 他经常告戒我不要和老年人开玩笑。
Miss Gao told me not to be late for class. 高老师告诉我上课别迟到。
15. I saw the man pull a gun out of his pocket.
我看见那人从口袋里掏出了一把枪.
When we were walking across the bridge, we saw a boy fall into the river.
当我们过桥的时候，我们看见一个男孩儿掉进河里。
I heard someone shout " Fire!" and then I heard people running and shouting.
我听到有人高喊"着火啦！"，接着我又听到人们在边跑边喊。