例如：I this film yesterday. （强调看的动作发生过了）

　　　I this film. （强调对现在的影响，电影的内容已经知道了）

* 使用现在完成时的句型

1） It is the first / second time.... that...结构中的从句部分，用现在完成时。

例如： It is the first time （that） .　这是我第一次听他唱歌。

* 注意：It was the third time that the boy had been late.

2） This is +形容词最高级+that...结构，that 从句要用现在完成时。

例如：This is the best film that . 这是我看过的最好的电影。　

Answers:

一般现在时: leave, moves, is, writes

一般过去时: did you go, played football, went to bed, came, lived, has lived, wondered, Could, used to take, is used to taking,

一般将来时: shall，Will，are you going to do，is going to，is going to，are to discuss the report，is about to leave for，leaves，comes，comes，have a nice time，am leaving

现在完成时: have （has） +过去分词, saw, have seen, I've heard him sing, I've （ever） seen