請問以下的句子用關代合併：
I know the man.
He can speak English.
=> I know the man who can speak English.
=> The man who I know can speak English.
這兩句用who合併後應該都沒有錯吧，只是第一個句子who是當主詞
第二個who是當受詞、whom用who代替，
可是第二個句子有錯嗎?
The house is big.
We live in the house.
=> The house which we live in is big.
=> We live in the house which is big.
=> The house which is big we live in.
這三句是用which合併，前兩句沒有問題，第三句似乎怪怪的
是有哪裡錯了呢?
另外，except 和except for的差別，我看之前的講法主要是
A和B種類不同時用except for，except for只可當介系詞用，
except則可當介系詞、連接詞、動詞用，可是有except不能放在句首的這個規定嗎?
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