情态动词 考试重点:情态动词+完成时
情态动词用来表示能力、允许、许诺、可能、劝告、意愿等概念或态度。情态动词无人称变化,在句子中和动词原形一起构成谓语。根据这几年的考试看,着重测验情态动词接完成时的用法。
一、must +现在完成时
表示对已发生的事情的一种肯定的猜测。
1、Mr. Green _____ my letter, otherwise he would have replied before now.
A. must have received B. must have failed to receive C. must receive D. must fail to receive
(答案:B)(1998年44题)
2、I believe he _____ an accident, otherwise he would have arrived on time.
A. would have had B. could have had C. should have had D. must have had (答案为D)(2001年58题)
二、should (ought to )+完成时
表示应该做的事情而没有做,否定式表示不该做的事情做了。含有对过去的动作的责备、批评。
1、They have done things they ought _____.
A. not to do B. not to be done C. not to have done D. not having done (答案为C)(1999年59题)
2、I’m sorry I couldn’t get in touch with him before he left, I _____ him earlier.
A. had a telephone B. have phoned C. should have phoned D. should be phoned (答案为C)(2000年26题)
三、could +完成时
表示能做的事情而没有做。表示对过去能做而未做的事情感到惋惜,遗憾。
1、He could have joined us, but he didn’t get our invitation in time.他本来能够参加我们的,但是他没有收到我们的请贴。
2、I could have passed, but I did not study hard enough. 我本来能及格的,但是没有努力学习。
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