我曾经到过美国。

　　I have been to America.

　　我曾见过李总统。

　　I have seen President Lee.

　　我有生以来没有跳过舞。

　　I have never danced in my life.

　　我看过“双城记”。

　　I have read The Tale of Two Cities.

　　他曾吃过这种冰淇淋。

　　He has tasted this kind of ice cream.

　　我未曾见过雪。

　　I have never seen snow.

　　你曾见过雪吗？

　　Have you ever seen snow？

　　你登过玉山吗？

　　Have you ever climbed Jade Mountain？

　　4.现在完成式可以用来表示一件过去常发生的事：

　　今年我国已有二次台风。

　　We have already had two typhoons so far this year.

　　他今年已发表了三篇论文。

　　He has already published three papers this year.

　　过去一年，我看了三次“铁达尼号”。

　　In the past year， I have seen The Titanic three times.

　　对读者而言，最重要的是“现在完成式”和“过去式”不同究竟在那里？最重要的不同在于，一旦在句子中讲一件过去发生的事，而且指定特定的时间，就一定要用“过去式”，而不能用“现在完成式”。比方说，“我曾经看过“铁达尼号”，可以用现在完成式，因为这句话没有指明任何特定的时间，假如说，我昨天晚上去看“铁达尼号”，就一定用过去式，读者不妨看看以下的比较：

　　（a）I went to America last year.

　　I have been to America.

　　（b）I saw The Titanic last year.

　　I have seen The Titanic twice.

　　（c）I finished my homework late last night.

　　I have finally finished my homework.

　　（d）I studied English when I was a small child.

　　I have studied English since I was a child.

　　（e）I went to church yesterday.

　　I have never been to church.

　　以下的句子是错的，请特别注意：

　　＊（1）I have seen the movie last year.

　　＊（2）I have never been to America last year.

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