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小博士：我们在这几个月的学习里，接触到不少的疑问词，其中疑问代词占大多数。那么疑问代词有哪些？又有哪些用法呢？看看下面的总结吧！
1)疑问代词在句中起名词词组的作用，用来构成疑问句。疑问代词有下列几个：
指人：who，whom，whose
指物：what
既可指人又可指物：which
2)疑问代词在句中应位于谓语动词之前，没有数的变化，除who之外也没有格的变化。无论是做疑问代词还是限定词，which和what所指的范围都是不同的。what所指的范围是无限的，而which则指在一定的范围内，例如：
Which movies do you like best?
你喜欢哪几个部电影？
What movies do you like best?
你喜欢什么样的电影？
你明白了吗？那么就请选用刚才我讨论过的疑问词完成下面句型转换。
1 My favorite subject is science.
________ ________ your favorite subject?
2 He likes art best.
________ ________ he like best?
3 My science teacher is Mr Green.
________ ________ your science teacher?
4 He's really busy today.
________ ________ really busy today?
5 Betty's backpack is in her bedroom.
________ backpack is here?
查看习题详情和答案>>根据所给的中文、音标或首字母提示，写出空白处各单词的适当形式，每空限填一词。
I have twin brothers, Tim and Tom. They look the same and l 【小题1】 of people don’t know who is who. They are 【小题2】 /tl / and thin. They have brown hair and blue 【小题3】 (眼睛), and they always wear jeans and T-shirts.
They like eating the same food, and they like doing the same things, too. For example, tomatoes and 【小题4】 (土豆) are their favorite food. They enjoy 【小题5】 (游泳) and playing football. They’d like to play computer games every n 【小题6】 , but our mother says they can’t because they have much 【小题7】 (家庭作业) to do.
They’re twins, but they aren’t the same in everything. For example, Tim works very 【小题8】 /hB:d/ at school, but Tom doesn’t. Tim’s favorite subject is math but Tom is 【小题9】 (感兴趣的) in history.
Our mother often 【小题10】 (离开) home for her job, so we all help with the housework at home.
I think it’s fun to have twin brothers. We are all happy to be brothers in the same family.