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定語從句的when
=when作為定語從句的引導(dǎo)詞時(shí)，表示時(shí)間，在從句中充當(dāng)時(shí)間狀語，后面需要加上完整的陳述語序。
句式如下：
表示時(shí)間的名詞+when+完整陳述句+句子其它成分。
when引導(dǎo)的定語從句可以放在主語，賓語或者表語，甚至為名詞的賓補(bǔ)之后。
例：
The night when we took a stroll in the park was so cold.
咱們?cè)诠珗@散步的那個(gè)晚上好冷。
night 做主語，被定語從句when we took a stroll in the park 修飾。
I remember the night when we took a stroll in the park.
我記得那個(gè)咱們一起在公園散步的夜晚。
night變成了賓語，被定語從句when we took a stroll in the park修飾。
What I can never forget is the night when we took a stroll in the park.
我永不能忘記的是咱們一起在公園散步的.那個(gè)夜晚。
night變成了表語，被定語從句when we took a stroll in the park修飾。
以上三組例句中，when后面所接的都是完整句，并且when 后的從句時(shí)態(tài)和主句一致。前提是when充當(dāng)?shù)膹木涞臅r(shí)間狀語，相當(dāng)于是at the night.
所以，以上三句，可以把when都改成at which。
寫作必備when引導(dǎo)定語從句句式：
There was a time when...... 曾經(jīng)。。。
There was a time when people were never bothered by pollution.
曾經(jīng)人們不用為污染煩憂。
We all experience a day when......我們都經(jīng)歷過。。。
We all experience a day when everything goes wrong.
我們都經(jīng)歷過事事不順心的一天。
we can never ignore the time when......我們絕不能忽視。。。
We can never ignore the time when computers penetrate our life and study.
我們不能忽視這個(gè)電腦滲透進(jìn)我們的生活和學(xué)習(xí)的年代。
關(guān)系副詞引導(dǎo)的定語從句
關(guān)系副詞可代替的先行詞是表示時(shí)間、地點(diǎn)或理由的名詞，在從句中作狀語。
1)關(guān)系副詞when, where, why的含義相當(dāng)于"介詞+which"結(jié)構(gòu)，因此常常和"介詞+ which"結(jié)構(gòu)交替使用。
例如：
There are occasions when (on which) one must yield.
任何人都有不得不屈服的時(shí)候。
Beijing is the place where (in which) I was born.
北京是我的出生地。
Is this the reason why (for which) he refused our offer?
這就是他拒絕我們幫助他的理由嗎?
2)that代替關(guān)系副詞，可以用于表示時(shí)間、地點(diǎn)、方式、理由的名詞后代替when, where, why和“介+which”引導(dǎo)的定語從句，在口語中that常被省略。
例如：
His father died the year (that/when/in which) he was born.
他父親在他出生那年逝世了。
He is unlikely to find the place (that/where/in which) he lived forty years ago.他不大可能找到他四十年前居住過的地方。
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