relative clause(which 同where)

首先要講的是，在關係子句中，which是關係代名詞，而where是關係副詞

而where其實有at which, to which, in which的意思（但沒有from which)

所以，當句子有at which, in which, to which意思時，我們會用where，如：

This is the city where I was born.(這句的where=in which)
Where shall we go?(這句的where=to which)

有了這個概念，想你現在應能分別何時用where，何時用which

relative clause有限定關係子句(defining relative clause)與非限定關係子句(non-defining relative clause)
限定關係子句是用以修飾先行詞（Antecedent)，而非限定關係子句，就只不過是補充資料之用。兩種子句，其分別在於非限定關係子句有逗號，而限定關係子句則沒有，如：

That is the boy who wrote the story.（那就是寫這故事的男孩）

I will teach the boy, who cannot afford the tuition fee.(我將會教那男孩，而他不能應付學能。

而Tom likes going to libraries where(= in which) he can find and read a lot of books. 看括號的英文，你就知為甚麼用where

This is th museum which we visited last month.因沒有in,at, from which之意，所以用which不用where

希望幫到你！

where = in which (在該處/在該地方) (1)This is the museum which we visited(vt.參觀/訪問/探訪) last month (correct) . This is the museum where/in which we visited(vi.逗留) last month (incorrect). (2) Tome likes going to libaries where(= in which 在該處) he can find and read a lot of books (correct).

1. where = place
which = items and animals

2. Relative clause is used to explain or supplement information about
the target, not the main clause. In other words, a relative clause
equals adjectival part.

3. the previous one

4. If you specifically describe a certain museum,
then you should use "where".
But, actually, "where" is acceptable in the sentence.

5. As mentioned above.

Hope you find it useful.