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1、现在完成时中非延续性动词转换,现在完成时是初中英语语法的重点之一。它表示过去发生的某一动作或存在的状态，一直持续到现在，并可以和以for或since引导的表示一段时间的状语连用，也可以用在以“how long”提问的句子中，句子中的谓语动词一般为延续性动词。但是，有些动词所表示的动作是短暂的，这类动词叫做非延续性动词。如：come, go, reach, arrive, leave, borrow, buy, join, die, begin, start, finish等。在现在完成时的句子中，非延续性动词作谓语动词时，不能和表示一段时间的状语连用。,常见错误,1（误）Tom has bou
2、ght the book for a week. （正）Tom has had the book for a week. 2 （误）My father had joined the Party for ten years. （正）My father has been in the Party for ten years.,转换,如果要表示动作的连续性，就要把非延续性动词转换成相应的延续性动词或短语，具体转换如下： buy-had leave-been away borrow/lend-kept start/begin-been on go to-been to/gone to/been in,
3、come/arrive/get/reach/move-been in/at/ here die-been dead begin/start-been on fall asleep-been asleep close-been closed catch a cold-had a cold put on -worn(wear 的过去分词）,borrow/lend-keep open-be open become-be leave/go-be away(from) end/finish-be over join the army-be in the army/be a soldier join th
4、e Party-be in the Party/be a Party member,Attention!,注意： 1. 非延续性动词可以在现在完成时的否定句中作谓语，并可以与for，since引导的时间状语连用，表示动作的延续过程。例如： She hasnt bought any new clothes since last year. 2. 在现在完成时的肯定句中，非延续性动词作谓语时不能与for，since引导的表示一段时间的状语连用，但可以用其他句式来表示同一个意思。例如： He has been away from Beijing for two years. = He left Be
5、ijing two years ago. = It is two years since he left Beijing. = Two years has passed since he left Beijing.,practice,用现在完成时改写下列句子，使A，B两句意思基本一致。每空限填一词 1. A. They came to our school in 1980. B. They _ _ _ our school since 1980. 2. A. The man died five years ago. B. The man _ _ _ for five years. 3. A. The meeting began two minutes ago. B. The meeting _ _ _ for two minutes. 4. A. We borrowed two books last week. B. We _ _ the two books for a week. 5. A. When did the train arrive here? B. How long _ the train _ here?,
