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slep考试之主动句变为被动句.

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�  SLEP考试中,语法常涉及到主动句变被动句,同学们在学习的过程中要谨记以下几点:

  当谓语动词是行为动词,而句中又没有情态动词或助动词时,需要在谓语动词之前加do not, does not或did not �来构成否定句。例如:

  I know something about it.

  → I don‘t know anything about it.

  否定由think、believe、know等动词引出的宾语从句时,应将主句改为否定形式。例如:

  She knows why the train is late.

  →She doesn‘t know why the train is late.

  谓语动词是be、have(作“有”讲),或谓语动词有助动词、情态动词时,在它们的后面加not.若句中有some时,需将some改为any.例如:

  I have some books on this subject.

  →I have not any books on this subject.

  He can speak English.

  →He cannot speak English.

  祈使句的否定形式是在谓语动词前直接加do not.例如:

  Read in bed.

  →Don‘t read in bed.

  特殊句型:

  陈述句中含有had better,要将其变为否定句时,要把not加在better后。例如:

  You had better go with me.

  →You had better not go with me.

  陈述句中含有“both (all) of �+名词”作主语,要将其改为否定句时,要用neither来代替both,none代替all,并注意谓语动词数的变化。例如:

  Both of them are Americans.

  →Neither of them is American.

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