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der, mand ,ask, tell, allow, permit ,warn二、使役動詞與to的省略 當不定式用于let, make, have等使役動詞后作賓語補足語,不定式必須省略to。如:Let me have another cup of 。She had him dig away the 。They made him tell them 。但是,當使役動詞用于被動語態(tài)時,其后的不定式則必須要帶to。如:他被迫一天工作20小時。誤:He was made work twenty hours a day.正:He was made to work twenty hours a day.注意,表示使役意義的let和have很少用于被動語態(tài)。另外注意,force, oblige等雖然也表示“使”,但它們后用作賓語補足語的不定式必須帶to。如:They forced her to sign the 。The law obliged parents to send their children to 。二、感覺動詞與to的省略 當不定式用于表示感覺的動詞feel, hear, notice, observe, see, watch, look at, listen to等作賓語補足語時,不定式必須省略to。如:We all felt the house 。I heard him go down the 。Did you notice her leave the house?她離開屋子你注意到了嗎?I watched her get into the 。但是,當feel后用作賓語補足語的不定式為to be時,則不能省略to。如:They all felt the plan to be 。注意,當這些動詞變?yōu)楸粍诱Z態(tài)時,不定式前的to不能省略。如:They were heard to break a glass in the next 。另外,若用作賓語補足語的不定式為完成式,則通常應帶 to。如:I noticed her to have e 。三、介詞except / but與to的省略 當不定式用作介詞except或except的賓語時,該不定式有時帶 to,有時不帶 to,情形比較復雜,大致原則是:其前有do,不定式不帶 to;其前沒有 do,不定式通常帶 to。如:He likes nothing except to watch ,他什么都不喜歡。It had no effect except to make him ,沒產生任何效果。There’s little we can do except 。I could do nothing except ,沒有別的辦法。 四、help與to的省略 當動詞help后跟一個不定式用作賓語或賓語補足語時,不定式可以不帶to,也可以不帶to。如:Can you help (to) carry this table upstairs?你能幫忙把桌子搬到樓上去嗎?I have lost my watch. Will you help me (to) look for it?我把表丟了,你能不能幫我找一下?但是,當help用于被動語態(tài)時,其后不定式必須帶to。如:Millie was helped to overe her fear of 。另外,當不定式為否定式時,其中的to通常不宜省略。如:How can I help my children not to worry about their exams?我怎樣才能幫助我的孩子們不為他們的考試著急呢?記憶口訣。一二三四半,一感,二聽,三讓,四看,半幫助,五、固定搭配與to的省略 Why not...? = Why don39。t you...? 習慣上接動詞原形,不能接帶to不定式或現在分詞,主要用于表示同意、贊成、勸誘等,其意為“為什么