1、I’ve just lost my keys.我剛丟了鑰匙。

2、Since when have you planted so many young trees?從什么時候開始你種植了這么多小樹的？

3、I have read the novel.我看過這部小說了。

4、They have gone out.他們已經出去了。

5、I have bad news. I have lost my job.有壞消息，我丟了工作了。

6、This is the first time I have been here.這是我第一次到這兒。

7、They haven’t finished yet.他們還沒結束。

8、How many times have you been to Singapore?你去過新加坡幾次？

9、My momhas never travelled by air.我媽媽旅游從來沒有坐過飛機。

10、I've been doing my homework.我一直在做作業。