用why造定語從句
英語學習最基礎的就是詞匯量的積累，大量的詞匯積累是我們學習英語最重要的。小編為大家精心準備了用why造定語從句，歡迎大家前來閱讀。
用why造定語從句如下：
The reason why he came is not very convincing.
Please tell me the reason why you missed the plane.
I don’t know the reason why he looks unhappy today.
I don’t know the reason why he came so late. 我不知道他來得那么晚的原因。
That is the reason why I don’t want to go. 那就是我不想去的理由。
He didn’t tell me the reason why he was so upset.他沒有告訴我他為什么那樣心煩意亂。
延伸閱讀：
關系代詞引導的定語從句
關系代詞所代替的先行詞是人或物的名詞或代詞，并在句中充當主語、賓語、定語等成分。關系代詞在定語 從句中作主語時，從句謂語動詞的人稱和數要和先行詞保持一致。
1）who, whom, that
這些詞代替的先行詞是人的名詞或代詞，在從句中所起作用如下：
Is he the man who/that wants to see you?
他就是想見你的人嗎？（who/that在從句中作主語） He is the man whom/ that I saw yesterday.
他就是我昨天見的`那個人。（whom/that在從句中作賓語）
2) Whose 用來指人或物，(只用作定語, 若指物，它還可以同of which互換）, 例如：
They rushed over to help the man whose car had broken down. 那人車壞了，大家都跑過去幫忙。
Please pass me the book whose (of which) cover is green. 請遞給我那本綠皮的書。
3）which, that
它們所代替的先行詞是事物的名詞或代詞，在從句中可作主語、賓語等，例如：
A prosperity which / that had never been seen before appears in the countryside. 農村出現了前所未 有的繁榮。（which / that在句中作主語）
The package which / that you are carrying is about to come unwrapped. 你拿的包快散了。(which / that 在句中作賓語）
關系副詞引導的定語從句
關系副詞可代替的先行詞是時間、地點或理由的名詞，在從句中作狀語。
1）when, where, why
關系副詞when, where, why的含義相當于"介詞+ which"結構，因此常常和"介詞+ which"結構交替使用，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代替關系副詞
that可以用于表示時間、地點、方式、理由的名詞后取代when, where, why和"介詞+ which"引導的定語從 句，在非正式文體中that常被省略（正式文體中不可省略），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。
定語從句中why的用法
請分析下面兩個簡單句：
句①He wanted to know the reason.
句②I was late for the reason.
把句②變為句①的定語從句，句①中的the reasons做定語從句的先行詞。因為the reason做介詞for的賓語，先行詞是the reason指物，在定語從句中介詞for提前，用關系代詞which替代the reason，the reason就不能在定語從句中出現了。由此得到句③He wanted to know the reason for which I was late.
注意：在定語從句中當先行詞為the reason(s)，定語從句由for which引導時，可以用why代替for which。由此我們得到句⑤He wanted to know the reason why I was late.
請把下面兩句話合并為一句，把第二句話變為第一句的定語從句。
The reason is not very convincing.
He came for the reason.
→The reason why he came is not very convincing.
The reason for which he came is not very convincing.
定語從句
定語從句，一個簡單句跟在一名詞或代詞后（先行詞）進行修飾限定，就叫做定語從句。在主句中充當定語成分。被修飾的詞叫先行詞。定語從句不同于單詞作定語的情況，它通常只能放在被修飾的詞（即先行詞）之后。
定語 從句由關系詞（關系代詞、關系副詞）引導，關系代詞、關系副詞位于定語從句句首。
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