动名词做主语谓语动词都用单数吗Sending emails()waste of time!用is 还是are?

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动名词做主语谓语动词都用单数吗Sending emails()waste of time!用is 还是are?

动名词做主语谓语动词都用单数吗Sending emails()waste of time!用is 还是are?
动名词做主语谓语动词都用单数吗
Sending emails()waste of time!用is 还是are?

动名词做主语谓语动词都用单数吗Sending emails()waste of time!用is 还是are?
动名词是动词加ing 形式而来,属于抽象名词,而且不能数,所以后面动词谓语要用单数形式.
这里要用is.