弄清楚非限制定語從句中which的指代問題，對英語寫作和口語表達具有立竿見影的意義！
關係代詞which在非限制性定語從句中所指代和修飾的可以是主句中的名詞、形容詞、短語、其他從句或整個主句，在從句中作主語、動詞賓語、介詞賓語或表語。
① which指代主句中的名詞，被指代的名詞包括表示物、嬰兒或動物的名詞、表示單數意義的集體名詞以及表示職業、品格等的名詞。如：
These apple trees，which I planted three years ago，have not borne any fruit.
這些蘋果樹是我三年前栽的，還沒有結過果實。
She is an artist，which I am not.
她是一位藝術家，而我不是。
Water，which is a clear liquid，has many uses.
水是一種清澈的液體，有許多用途。
② which指代主句中的形容詞。如：
She was very patient towards the children，which her husband seldom was.她對孩子們很耐心，她丈夫卻很少這樣。She is always careless，which we should not be.
她總是馬虎大意，我們可不應該這樣。
③ which指代主句中的某個從句。如：He said that he had never seen her before，which was not true.
他說以前從沒見過她，這不是真的。
④ which指代整個主句。如：
In the presence of so many people he was little tense, which was understandable.
在那麼多人面前他有點緊張，這是可以理解的。
He may have acute appendicitis，in which case he will have to be operated on.
他可能得了急性盲腸炎，如果是這樣，他就得動手術。
When deeply absorbed in work，which he often was，he would forget all about eating and sleeping.
他經常聚精會神地工作，這時他會廢寢忘食。
對比：
1、He gave me a toy bear as birthday present,which made me very happy.
2、He gave me a toy bear on my birthday,which is a present I was longing for.
很顯然第一句指代前面句子,因為是他送我禮物這件事情讓我高興,
而第二個句子是指代那個玩具熊,因為我想要的禮物是這個玩具熊.
1、I received an invitation from my boss, which came as a surprise.（which指invitation)
2、I don't want to get married, which makes my parents agnry.（which指不結婚那件事）
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