What film is your favourite film?
What film is your favourite film?What film is your favourite film? Or: Which film is your favourite film? Which is right? 当我想问：哪一部电影是你的最爱时，应用which 还是what来提问？ 还是应该这样问： What is your favourite film?
which film do you like best? 如果楼主真是问最爱 的话不是ｗｈａｔ应该是用ｗｈｉｃｈ，因为ｗｈｉｃｈ的重点在“哪个”而ｗｈａｔ就很通俗的问了 不过ｗｈｉｃｈ大多是在有选择下（前面有情节或是电影列表） ｗｈａｔ在想开始对话时使用。
What 多用于在没有选择的情况，而Which则用于有选择时。 例如：What is your favorite friut? Which is your favorite friut,apple or orange?
what is your favorite film?应该说是较好的，，或者说which film do you like best?
what is your favorite moive? /which moive is your favorite?
What is your favourate film?是最准确的表达，what等于which film，所以Which film is your favourate one?也是对的。而What film则感觉不太好。
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