非谓语动词作主语时谓语用单数.但是如果是两个并列的就象是两个名词并列时候就用复数了.给你两个例子吧
To learn english well, listening is very important.
listengling作主语,动词用is
To learn Enlish well, listening and speaking are very important.
这句话中主语是listening和speaking,所以用了动词are
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