在不定式标志to前加上not.例如:
Tell him not to shut the window.让他别关窗。
She pretended not to see me when I passed by. 我走过的时候,她假装没看见。
典型例题
1)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. 的否定形式为warn sb not to do sth. 此处用的是否定词never.
2) 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 为not to do it 的省略形式。可以只用to这个词,而不必重复整个不定式词组。及物动词do后应有宾语,因此也B,D不对。
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