典型例題

　　1) ---- I usually go there by train.

　　---- Why not ___ by boat for a change?

　　A. to try going　 B.　trying to go　 C.　to try and go　 D.　try going

　　答案：D. why not 后面接不帶to 的不定式，因此選D。

　　2) Paul doesn't have to be made ___. He always works hard.

　　A. learn　 B. to learn　 C. learned　 D. learning

　　答案：B. make后接不帶to 的動(dòng)詞不定式，當(dāng)其用于被動(dòng)時(shí)，to 不可省略。

　　動(dòng)詞不定式的否定式

　　Tell him not to shut the window…

　　She pretended not to see me when I passed by. 我走過(guò)的時(shí)候，她假裝沒(méi)看見(jiàn)

　　典型例題

　　1) Tell him ___ the window.

　　A. to shut not　 B. not to shut　 C. to not shut　 D. not shut

　　答案：B。 tell sb to do sth 的否定形式為tell sb not to do sth。

　　2) She pretended ___ me when I passed by.

　　A.　not to see　 B. not seeing　　C. to not see　 D.　having not seen

　　答案：A。 pretend 后應(yīng)接不定式。其否定形式為pretend not to do sth.。

　　3) Mrs. Smith warned her daughter ___ after drinking。

　　A. never to drive　 B. to never driver　C. never driving　 D. never drive

　　答案：A。warn sb to do sth. 的否定形式為warn sb not to do sth. 此處用的是否定詞never。

　　4) The boy wanted to ride his bicycle in the street，but his mother told him ____.

　　A. not to　　B. not to do　　C. not do it D. do not to

　　答案：A。not to 為not to do it 的省略形式。可以只用to這個(gè)詞，而不必重復(fù)整個(gè)不定式詞組。及物動(dòng)詞do后應(yīng)有名詞、代詞等，否則不對(duì)，因此B，D不對(duì)。

　　5) The patient was warned ___ oily food after the operation。

　　A. to eat no　 B. eating not　 C. not to eat　D. not eating

　　答案：C。warn一詞要求后用不定式，此處為不定式的被動(dòng)，否定形式為be warned not to do。