非谓语动词有三种:不定式、动名词、现在分词,这三种怎么区分,谢谢_百度...答:带to的不定式: I refused to study the lessen.2, 分词现在分词: He is studying.过去分词: The problem should be carefully studied.3,动名词He enjoys studying.带to不定式用法1,不定式当名词用名词在句子中可以做主语,宾语,表语,所以带to不定式也可以做主语,宾语,表语。做主语 To take a trip around the ...