need可以是情态动词,这时的用法是后直接跟动词原形:I need have a rest.
但need还有一个用法是作行为动词,这时假如后再跟动词就需要先加to了.如你所举的例子就是:You need to take a bus.
为什么need和其他情态动词不一样,要+个to才能+动词You need to take a bus
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