1、I've never heard of anyone doing that.我从未听说有人做那种事.
2、l have played the piano .我已经弹过钢琴了.
3、Have you had lunch yet?-Yes,I have.I've just had it.
4、He has taught here since 1981 .他自1981年就在这儿教书.（可能还要继续教）
5、I have't seen her for four years.我有四年没见到她了.
6、I have been to Beijing twice.我去过北京二次.
7、We have already finished our homework.我们已完成作业了.
8、They haven't finished their homework yet.他们还没有完成作业.
9、Have you ever been to the Great Wall?你曾经去过长城吗?
10、I have never been to the Great Wall.我从未去过长城.
11、I have seen her before,but I can not remember where.
I have already eaten lunch.我已经吃过早餐了。
He hasn't been back yet.他直到现在还没回来。
Have you got over this problem yet?你（直到）现在解决这个问题了吗？
I have did my homework
I have watched TV
He has eaten an apple.
道I have leraned English for three years.
Have you seen the film?
He hasn't finished his homework yet.
They have already cleaned the room.