never ,before, not yet, etc. Have you ever found out her telephone number? (2) have been to

　　VS

　　have gone to

　　(3) since

　　I have done it since you left.

　　It is three years since I saw you.

　　I have lived here ever since. (4) I have left.

　　但I have been away for three days. (5) When have you done it? 错 (6) It is the third time he has been late this week. (7) 在含有时间状语或条件状语的复合句中，强调从句的动作发生在主句动作之前，从句用现在完成时代替将来完成时。 I’ll go with you when I have had this cup of tea. 4、现在完成时与一般过去时的用法比较 一般过去时只单纯表示过去发生过的动作或存在的状态，与现在时间没有联系，可和表示确切过去的时间、地点状语连用。现在完成时表示过去发生过的某动作对现在造成的影响或结果，强调现在的情况，不能和表示确切的过去时间、地点状语连用。 She has promised to help me.

　　Last week she promised to help me. (2) He has been caught by the police.

　　He was caught by the police at a restaurant. (3) Mr. Black has lived in China for ten years.

　　Mr. Black lived in China for 3 years in the 1990s. 5、现在完成时与现在完成进行时的用法比较

　　现在完成时表示动作已完成，侧重结果；现在完成进时既可表示动作在说话时刻之前刚刚结束，也可表示动作还将继续下去，侧重于动作的持续性、暂时性和未完成的含义。 They have repaired the road.

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