(6)would rather和would sooner之间一般没有区别,但经常接触到的是would rather。 【知识运用】填空题: 1. The light is on, so they ______ be at home. 2. Child as he is, he ______ do a lot of things by himself. 3. Whoever works out the maths problem ______ be given a pen as a reward. 4. As students, we ______ try hard to take advantage of time to study. 5. Turn to your teachers when you have any problems. They ______ help you with your subjects. 答案: 1. must 2. can 3. shall 4. should 5. will 1. You ________ be right, but I don't think you are.
A. can
B. could
C. must
D. should 【分析】B 从语境上看,C、D不宜选,在剩下的A和B中,许多同学想当然地选了A,认为整个句子为现在时态,所以选can,而不选过去式 could。但是最佳答案却是B而不是A。按照英语语法,情态动词can 用于推测表示可能性时,通常只用于否定句或疑问句中,而不用于肯定句中;但 could 用于表推测时,却不仅可用于否定句和疑问句,也可用于肯定句,且此时的 could 并不是 can 的过去式,与 can 也没有时间上的差别,只是 could 比 can语气更委婉。 【分析】顺便说明一点,can 在以下特殊情况下,可用于肯定句。一是表示抽象的可能性,即从理论上或逻辑上分析是可能的,但是实际上未必会发生。如:Anyone can make mistakes. 任何人都可能会犯错误。二是后接“be (get, seem, become)+形容词”,表示“有时会”、“时常会”等。如:My father can be very unreasonable. 我父亲有时候很不讲道理。
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