如果主语是复数的话就用are,主语是单数的话就用is!而且要求是一般现在时的情况才可以用are,is。如果是过去式就用was,were。如果是一般将来时就统统用will be
What are your strengths and weaknesses ?
谓语动词用are ,因为【strength and weakness 是“可数名词”】。
又如:
Tolerance is one of her many strengths.
What are his weaknesses?
用is
what is your advantage and weakness?