不要混淆祈使句与非谓语动词 有这样一道语法考题，该用动词原形？还是用非谓语动词？ _________ the road round to the right and you’ll find his house. http://yingyu.chazidian.com A. Follow B. Following C. To follow D. Followed 【分析】此题容易误选B或C，许多同学一看选项就想当然地认为，选现在分词表示时间或伴随，选不定式表目的。此题的关键是要注意句中的连词and，它表明整个句子是一个并列句，即 and 前后应各是一个独立的句子，而不应是一个非谓语形式的短语，所以此题的正确答案应选A，即 and 前是一个祈使句。比较以下两题： (1) _________ the road round to the right, she found his house. A. Follow B. Following C. To follow D. Followed 【分析】此题应选B，现在分词短语表时间。 (2) _________ the road round to the right, the blind man asked a boy to guide him. A. Follow B. Following C. To follow D. Followed 【分析】此题应选C，不定式短语表目的。 注意以下各题均应选A，均因为句中的并列连词 and（填空句为祈使句）： (1) _________ the milk and set a good example to the other children. A. Drink B. To drink C. Drinking D. Having drinking (2) _________ me, and don’t just stand there laughing. A. Answer B. To answer C. Answering D. To be answering (3) _________ me , and then try to copy what I do. A. Watch B. Watching C. To watch D. Have watching (4) _________ through this book and tell me what you think of it. A. Look B. Looking C. To look D. Having looked (5) _________ it with me and I’ll see what I can do. A. Leave B. Leaving C. If you leave D. When left 注：有时可能不用连词，而用破折号（答案均选B，填空句为祈使句）。如： (1) _________ down the radio — the baby’s asleep in the next room. A. Turning B. Turn C. Turned D. To turn (2) _________ some of this juice — perhaps you will like it. A. Trying B. Try C. To try D. Having tried 以下各题也应选A，是因为句中的从属连词 when, before, until 等（填空句为祈使句）： (1) _________ left when you get to the end of the street. A. Keep B. Keeping C. To keep D. Kept (2) _________ you hand over your mouth when you cough. A. Put B. Putting C. To put D. To be putting (3) _________ him enough time to get home before you telephone. A. Give B. To give C. Giving D. Given (4)_________ until the lights have turned to green. A. Wait B. To wait C. Waiting D. Having waited (5) _________ the pieces of cloth with a loose stitch before finally sewing them together. A. Join B. To join C. Joining D. Joined 以下各题也应选A，即填空句为祈使句： (1) Don’t give me a long account, just _________ the plain facts. A. tell B. telling C. to tell D. to be telling (2) First _________ the rice by washing it, then _________ it in boiling water. A. prepare, cook B. preparing, cooking C. preparing, cook D. prepare, cooking (3) Don’t sit there watching — _________ and help me! A. come B. coming C. to come D. to be coming (4) Don’t waste your money on silly things — _________ it. A. save B. to save C. saving D. having saved (5) To test eggs, _________ them in a bowl of water: if they float they’re bad, if they sink they’re good. A. put B. putting C. to put D. to be putting 但是，以下各题情形有所不同，所填部分为目的状语(用不定式，即答案均为B)： (1) _________ late in the morning, Bob turned off the alarm. A. Sleep B. To sleep C. Sleeping D. Having slept (2) _________ the early bus, Mr Smith got up at six. A. Catch B. To catch C. Catching D. Having caught