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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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

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.