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Question

.Carl _____ to ask his taecher for leave,but he _____ not do so.
A.need;dare B.needs;dares C.needs;dare D.need;dares

Answer 1

答案是C.
need to do sth 这时need是行为动词，所以有三单形式needs；
dare not do so 这时dare是情态动词，无三单形式。

Answer 2

C
单三人称；这里只能把dare看做情态动词，否则dare作实意动词时不能直接跟not而应用does not dare，故情态动词dare不用单三人称

Answer 3

这句话不对，应该是：

Carl _____ to ask his taecher for leave,but he doesn't _____ to do so.

needs; dare本回答被提问者采纳

Answer 4

B

Answer 5

C