精选优质文档-倾情为你奉上不定式作主语通常表示一次性、未来的且具体的特指动作。 而动名词作主语通常表示习惯性、经常性和不具体的泛指动作。 动名词作主语和不定式作主语有时可以互换,例如:It is dangerous playing (to play) with fire. Seeing is believing. / To see is to believe.翻译方法不同,但中文意思还是很相似的: To see is to believe.百闻不如一见 Seeing is believing.眼见为实一、主语（subject）:句子说明的人或事物。The sun rises in the east.（名词）He likes dancing.（代词）Twenty years is a short time in history.（数词）Seeing is believing.（动名词）To see is to believe.（不定式）What he needs is a book.（主
