1、I’ve just lost my keys.我刚丢了钥匙。
2、Since when have you planted so many young trees?从什么时候开始你种植了这么多小树的？
3、I have read the novel.我看过这部小说了。
4、They have gone out.他们已经出去了。
5、I have bad news. I have lost my job.有坏消息，我丢了工作了。
6、This is the first time I have been here.这是我第一次到这儿。
7、They haven’t finished yet.他们还没结束。
8、How many times have you been to Singapore?你去过新加坡几次？
9、My momhas never travelled by air.我妈妈旅游从来没有坐过飞机。
10、I've been doing my homework.我一直在做作业。
