句型7

　　…before…特殊用法（1）“沒來得及……就……”

　　[例句

　　The roof fell before he had time to dash into the room to save his baby.

　　他還沒有來得及沖進房間救孩子，房頂就塌了。

　　He ran off before I could stop him. 我還沒有來得及阻止，他已經跑了。

　　To my great disappointment, my favorite singer left the concert before I could have a word with her.

　　讓我非常失望的是，我還沒有來得及和我最喜歡的歌手打招呼，她就已經離開了。

　　句型8

　　…before…特殊用法（2）“過了多久才……”或“動作進行到什么程度才……”

　　[例句

　　They walked about fifty miles to the west before they saw a village.

　　他們西行50英里才看到一個村莊。

　　The workers worked day and night about three days before everything returned to normal.

　　工人們連續工作3天才使一切恢復正常。

　　He almost knocked me down before he knew it.

　　他幾乎撞到我了才意識到。

　　We had walked a long way before we found some water.

　　我們走了很長的路才找到一點水。

　　Five years went by before I knew it. 不知不覺，五年過去了。

　　句型9

　　It was + 時間段+before….“過了多久才（怎么樣）……”

　　It was not long before….“不久，就……”

　　It will (not) be +時間段+before….“要過多久（不久）……才……”(before從句謂語動詞要用一般時態)

　　[例句

　　It was not long before he sensed the danger of the position.不久他就意識到他處境的危險。

　　It was five days before he came back. 五天后他才回來。

　　It will be half a year before you graduate from the school. 再過半年你才能畢業。

　　It will not be long before they understand each other. 他們大概不久就會互相了解。

　　句型10

　　in case of…(+n.) “以防；萬一”；

　　in case that…“以防，萬一……”（謂語動詞用一般現在時態或should+動詞原形）

　　[例句

　　In case of fire, what should we do?

　　Please remind me about it in case I forget/should forget. 萬一我忘了，請提醒我。

　　In case (that) John comes/should come, please tell him to wait.

　　Please take your umbrella in case (that it rains/should rain).帶上雨傘，以防下雨。