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to hAvE DonE

前者是动词不定式的完成式形式,后者是动词不定式的被动语态形式。 动词不定式的完成式表示的动作一般发生在谓语动词所表示的动作之前,由to have加过去分词构成。当动词不定式的逻辑主语是已经去世的人的时候,动词不定式一般皆用完成式。如: ...

having done 表示主动完成,作状语多,作宾语也有,但少见 Having reviewed my lessons,I go to bed. 我复习完...所以主动完成 to have done 表示过去,主要是要学会区分to do I am sorry to keep you waiting, to keep 说明你还没让他等,先提前打招...

三者的主要区别为动作的完成状语不同: 1.to do强调去做,但还没做,例: I have something to do tomorrow. 明天我有些事情要去做. 2.to be doing 强调正在做,例: Everyone seems to be doing it. 每个人似乎都在这样做。 3.to have done强...

was/were to have done不等于should have done 一般说来,“be to do” 这个结构有两种语法意义,其一是连系动词be+动词不定式做表语,其二是be to是一个独立词汇单位,具有情态含义,可以把它叫做情态习语(modal idiom). 一、be +动词不定式,不定式做...

be to do: (1)表示事先商定、安排或准备要做的事情。如: The students are to meet at the school gate tomorrow. 明天学生们将在学校大门口集会。 (2)表示可能性,必要、责任、义务、禁止等。如: Her necklace was not to(couldn't)be fo...

to do后面表示的是将来时态,代表某人被认为 将要做某事。 to be doing 表示的是现在时态,代表某人被认为 目前正在做某事。 to have done表示的过去时态,代表某人被认为 应经做过某事。 例 Lucy is believed to go to London. Lucy被认为 将要...

首先,一般是sb is reported to have done sth.因为这个是表主动。据说某人干了某事。 He was reported to have made an important discovery. 据报导他有重要发现。 Some people were reported to have seen Unidentified Flying Objects . 据...

have sth to be done和have sth done的区别不容易混淆,容易混淆的是 have sth to be done 和have sth to do,下面就三个词组一一分析: 1、have sth to be done,表示说话的人并非是这个动作的执行者,而是让别人去做. 2、have sth to do 主语和动...

大哥英语不是这么学的 be said属于被动语态,而to have done是动词不定式的完成形式 合起来表示据说做了,,,,,, 想学那句用法就去看看语法书 学英语不是记每个句子的用法 不然这样累死你 句子多的数不完

He seems to do ..他像是准备作某事 举例:He seems to watch TV. 他好像要去看电视。 He seems to have done..他好像已经做完某事 举例:He seems to have finished his homework. 他看起来已经做完家庭作业了。 He seems doing ...他像是正在...

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