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推测性情态动词是高考英语的重要考点之一。学习这些情态动词时，应注意下列几点：一、了解推测性情态动词的使用范围may／might意为“或许”、“可能”，常用于肯定句。在否定句、疑问句中应该用can的有关形式。但是也可有maynot的形式，意为“可能不”。must意为“一定”、“必定”，常用于肯定句。在否定句、疑问句中应该用can的有关形式；can／could表示“或许”、“可能”，常用于否定句和疑问句中。例如：
The speculative modal verb is one of the important test points for college entrance examination English. When learning these modal verbs, the following points should be noted: First, understand the scope of use of speculative modal verbs may/might means “may”, “possible”, often used in affirmative sentences. The relevant form of can should be used in negative sentences and question sentences. But there may also be the form of maynot, which means “may not be”. Must mean “certain” and “must be” and is often used in affirmative sentences. The relevant forms of can should be used in negative sentences and question sentences; can/could means “maybe” and “possible” and are often used in negative sentences and question sentences. E.g: