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情态动词是中学英语语法的重要项目之一,是历年高考的热点,其用法复杂,不易掌握。从历届高考题看,情态动词的命题热点主要集中在以下三个方面: 热点一:情态动词的非推测性用法一、can表示能力时,注意它与be able to的区别。 1．can的主语可以是人或物,而be able to通常是有生命的东西。例如: The machine can work out two million problems per minute．这台机器每分钟可以计算出两百万道题。 2．can只有现在和过去两种时态形式,即:can和 could;而be able to有谓语动词的各种时态变化,还有
Modal verbs are one of the most important items in English grammar for middle school students. They are hot spots in college entrance examinations over the years. Their usage is complex and difficult to master. From the previous college entrance examination questions, the proposition hot topics of modal verbs are mainly concentrated in the following three aspects: Hot spot one: non-speculative usage of modal verbs First, when can represent ability, pay attention to the difference between it and be able to. 1. The subject of can can be a person or thing, and be able to usually be a living thing. For example: The machine can work out two million problems per minute. This machine can calculate two million questions per minute. 2. Can only the present and past two tense forms, namely: can and could; and be able to have various tense changes of the predicate verb, and