are you washing clothes?is your sister wattching tv?这两句为什么一个用are 一个用is

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areyouwashingclothes?isyoursisterwattchingtv?这两句为什么一个用are一个用isareyouwashingclothes?isyoursisterwattc

are you washing clothes?is your sister wattching tv?这两句为什么一个用are 一个用is
are you washing clothes?is your sister wattching tv?这两句为什么一个用are 一个用is

are you washing clothes?is your sister wattching tv?这两句为什么一个用are 一个用is
第一句主语是you,谓语当然是are;
第二句主语是your sister,谓语所以用is.