特殊疑问句的构成是特殊疑问词（如what,who）+一般疑问句
所以第一句where did you buy this?中有DID
第二句,因为是问你昨天在干什么,所以肯定是过去式 are的过去式were
至于什么时候用do,什么时候用be,要看后面的动词,如果是实意动词（如buy,run）就要用do的不同形式,不然就用be的不同形式
英语翻译为什么是where did you buy this?而不是where you buy this?为什么要加DI
2个回答
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