不定式的基本形式为to 360问答do,根据时态不同也由to be doing;to have done之类,被动使用to b大搞济组几消济治觉少e done每个不定式作非谓语时都会有逻辑主语,只不过有酸印一即述光眼美时这个逻辑主语就是句子的主语,如:I want to have a meal.(吃饭的人就是“我”)有时当句支子的主语不是不定式逻辑主语时,不定式与谓语构成主谓或动宾关系如:Here's some question for him to answer.(主谓) These goods are to be shipped to the dock.(动宾)