③“since法”It is/has been three years since he joined the army.
过去完成时had done 1.表示在过去某一时间以前已经完成的动作。He had shut the door before the dog came up.
Everything had been all right up till this morning.
2.表示动作或状态从过去某个时刻开始一直延续到另一个过去时刻才完成,甚至还要继续下去。At the age of ten,he had learned 500 English words.
He had been ill for a week when we learned about it.
3.常用hope,expect,think,intend,want,suppose等动词的过去完成时来表示未实现的希望、打算或意图。We had expected that you would be able to win the match.
将来完成时 will/shall have done 用来表示在将来某个时刻(前)将完成的动作。常和by短语,when,before引起的时间状语连用。We will have finished senior Book 2 by the end of this term.
现在完成进行时has/have been doing 用来表示从过去某一时刻开始一直持续到现在还要继续去)的动作。He has been doing the maths problems since 8:00. 过去完成进行时had been doing 表示动作或状态从过去某个时刻开始一直延续到另一个过去时刻才完成,继续下去。 一般将来时will/shall do
is/am/are going to do
is/am/are(about)to do一般将来时表示将来要发生的动作和存在的状况过去将来时would/should do
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