作业帮被动语态与现在完成时的构成
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被动语态与现在完成时的构成
被动语态与现在完成时的构成
被动语态与现在完成时的构成
现在完成时用来表示之前已发生或完成的动作或状态,其结果的确和现在有联系.动作或状态发生在过去 但它的影响现在还存在；也可表示持续到现在的动作或状态.其构成：have (has) +过去分词.
现在完成时的时间状语：for,since,so far,ever,never,just,yet,till / until,up to now,in past years,always,不确定的时间状语
用于现在完成时的句型
1）It is the first / second time…that…结构中的从句部分,用现在完成时.
It is the first time that I have visited the city.
It was the third time that the boy had been late.
2）This is the… that…结构,that 从句要用现在完成时.
This is the best film that I've (ever) seen.这是我看过的最好的电影.
This is the first time (that) I've heard him sing.这是我第一次听他唱歌.
被动语态:be (is/ am/ are/ was / were) done
其中be动词应根据具体句子的时态来决定.
现在完成时:
have done
has done