英语1.The first thing you must do is ___________the teachers b

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英语
1.The first thing you must do is ___________the teachers before class
为什么要填动词不定式而不能用动名词?
2.一个句子在开头划线,如何选择是填动名词还是动词不定式?请举个例子

1.is后面表目的根据句意判断
2.开头是动词不定式大多出现在某件事未发生的情况下,而即将要去做的.
开头是动名词大多是形容做某件事的感受或利弊等
eg.（1）To pass the test,I have to work hard.
(2) Watching the film is an enjoyable experience.

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