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复习现在完成时态的定义、构成以及运用。
定义。
用于强调一个发生在过去的动作对现在所产生的影响，此时这个动作一般不会延续到现在。
Have you found your lost key yet? --- No, I haven’t found it yet.
（2）用于描述一个发生在过去，并一直延续到现在，或者可能还要延续到将来的动作。常和for和since连用。
①They have worked in the factory for ten months .
②We have learned English since nearly three years ago.
谓语部分结构：have / has + 动词的过去分词
标志词即与现在完成时连用的时间状语。
ever、never、yet、already 、recently 、just、since 、for、so far、
in the past / last few years等。
4、 have/ has been to, have/ has gone to, have/ has been in的区别
（1）have/ has been to：曾经去过，强调以往的经历。
She has been to xi’an.
（2）have/ has gone to：去了某地，强调还没有回来。
She has gone to xi’an.
( 3) have/ has been in：待在某地，住在某地。
She has been in xi’an for three days.
5、非延续性动词与一段时间状语连用时可采用将非延续性动词转化为延续性动词的方式。
1 borrow ________ keep
2 buy ________ have
3 open ________ be open
4 close ________ be closed
5 start/ begin ________ be on
6 die ________ be dead
7 get married ________ be married
8 leave________ be away
9 return ________ be back
10 come ________ be here
11 join ________ be in/ be a member of