are是系动词be的变化形式之一,是用于代词第二人称单数和其他人称复数及名词复数的现在形式.它的基本意思是“是”.汉语中形容词可作谓语,英语不行,在形容词前必须有系动词.系动词 + 表语（这里是形容词tired) 共同构成谓语.
why are you so tired todoy?
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是why you are so cool还是 why are you so cool
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