【头脑风暴】 7. Another time five months ago, I happened to be upstairs at dusk when the window was open. 还有一次，就在五个月以前的一个傍晚，我碰巧在楼上，窗户是开着的。 【仿写】 1.

　　He happened ___________ the secret, so I needn’t tell him. 他碰巧已经知道了这个秘密，所以我不需要再告诉他。 2.

　　______________ he had to take part in a meeting that afternoon.

　　碰巧那天下午他得参加一个会议。 【单句改错】 3. A car accident was happened to her this morning.

　　Key：1. to have known　2. It happened that　3. 去掉was 【微解析】 happen后面接不定式时，意为“碰巧；恰好”。 当 happen 后面的不定式所表示的动作正在进行或已经完成时，须用不定式的进行式to be doing或完成式to have done。happen表示“碰巧或恰巧发生某事”时，还可用“it happens/happened that…”这一句型来表达。

　　Dear Xiaoming,

　　I have heard that ① _________________________. As you didn’t return home in time last Saturday night, your parents were angry with you. Perhaps you are still upset now. ② ________________________________________, it is your fault this time. When you didn’t come back as you had promised, your parents would be worried about you. You should have told them ahead of time by phone. ③ ____________________________________________. Perhaps they will feel they are too hard on you. Anyway, ④ ____________________________________________. Best wishes. Yours sincerely,

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