1.A.I've kept this book for 2 years B where did u bought it? A I bought in my hometown. 2.A Have you watched this film? B Yes,I have A when did you watch it? B I watched it on last Sunday.
根据具体语境来定一般现在时：经常发生的行为 Where do you shop\go shopping?正在进行时：正在进行的行为：Where are you shopping\going shopping?一般过去时：已经完成的行为：Where did you shop\go shopping? 过去的经常行为：Where did you use to shop\go shopping？需要根据你学的内容和具体语境来定。希望可以帮到你。
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
吧啦左耳
