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MUST 后面的时态E.g.The teacher said,“John,you must bring your boo

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MUST 后面的时态
E.g.The teacher said,“John,you must bring your book to the class
=The teacher told John that he must bring his book to the class.
第2句的MUST,后面的BRING用的是一般现在时,那是不是MUST后面的动词一定用一般现在时(原型)啊?
MUST 后面的时态E.g.The teacher said,“John,you must bring your boo
must是一个情态动词.情态动词本身有时态的变化,但是情态动词后面跟的动词必须是动词原形.