非谓语动词的否定式中否定词放在何处

有这样一题：

The patient was warned __________ oily food after the operation.

A. to eat not B. eating not C. not to eat D. not eating

主要考查在非谓语动词的否定式中，否定词的位置。一般说来，非谓语动词的否定式只能在非谓词动词之前加否定词; 若非谓语动词包括几个词(如是完成式、被动式等)，则只能在非谓语动词的第一个词前加否定词; so as to，in order to 等结构的否定式，not只能放在不定式符号to之前。

此题应选C。如：

1. She pretended _________ me when I passed by.

A. not to seeB. not seeing

C. to not seeD. having not seen

2. Tom kept quiet about the accident __________ lose his job.

A. so not as to B. so as not to

C. so as to not D. not so as to

3. Mrs Smith warned her daughter _________ after drinking.

A. never to driveB. to never drive

C. never drivingD. never drive

4. _________ a reply，he decided to write again.

A. Not receivingB. Receiving not

C. Not having receivedD. Having not received

答案：1. A 2. B 3. A 4. C