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*，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 n*r travelled by air.我*旅游从来没有坐过飞机。
10、i've been doing my homework.我一直在做作业。