在英语中，which是一个经常出现的单词。与其他疑问词（如what、where、when、why）一样，它用于询问某些事物或信息。但你知道吗，which实际上还可以担任其他语法角色，下面就请跟着我一起详细了解一下。

首先，作为疑问词，which通常可以用于询问选择（choice）或者是特定的事物（specific thing）。例如：

- Which movie do you want to watch tonight?
- Which shirt should I wear to the party?
- Do you remember which road we took to get to the beach?

此外，which还可以用作形容词。在这种情况下，它可以用来引导一个限定从句（relative clause），表示某个可选择的事物。例如：

- There are many apples on the table, but I want the one which is red.
- She has many books, but the one which has the blue cover is her favorite.
- The dress which she wore to the party last night was really beautiful.

最后，which还可以作为副词。在这种情况下，它通常与前面的介词一起使用，用于强调一些从句中的具体信息。例如：

- He showed me his new car, in which he is very proud.
- The restaurant, from which we ordered takeout last night, is very famous.
- The museum, through which we walked this morning, had many interesting exhibits.

总之，which是一个非常常见的单词，可以在不同的语法角色中使用。当你学习英语的时候，一定要注意它的使用方式和语境，这样才能更好地掌握和运用它。