課本中不會教你的[B]109 before long和long before
109 before long和long before
① before long意為“不久，很快，一會兒后”，相當于soon，after a short while，多用于將來時或過去時中。
He will return before long. 他不久就會返回的。
Before long they got enough money to build the school. 不久，他們就弄到了足夠的錢建造那所學校。
② long before意為“很久以前”，相當于long ago，before是副詞，常用于過去時中。
They left their hometown long before. 他們很久以前離開家鄉(xiāng)的。
She said that she had known your name long before. 她說她早就知道你的名字。
③ long before+句子表示“在……前很久，要過很久……才”，not long…before+句子表示“不久就……，不多久……就”，這里的before是連詞。這種結構可用于過去時或將來時。
It was not long before she got everything ready. 不久，她就把一切都準備好了。
It won't be long before he finishes reading the book. 他不久就會讀完這本書。
It will be long before the train arrives. 要過很久火車才能到達。
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He will be here before long. 他不久就會來這里。
He was here long before. 他很久以前在這里。
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注意下面的類似結構：
It was some days before… 過了好幾天才……
It was quite some time before… 過了好半天才……
It was hours before… 過了好幾個鐘頭才……
It will be years before… 要過好幾年才……
