四、由從屬連詞后接過去分詞構成的省略結構

這類省略比較重要的是由從屬連詞although, as, as if, as though, if, once, unless, until, when, while 等后接過去分詞構成，注意此時過去分詞的邏輯主語通常應與句子主語一致。如：

Although never married, they lived together as husband and wife for fifty years. 雖然從未結婚，但他們像夫妻一樣在一起生活了50多年。

I am sending you information on holidays as promised. 正如所許諾的那樣，我現在給你寄去關于度假的資料。

He was speeding down the motorway as if pursued by a demon. 他在公路上高速行駛，就像有魔鬼在追趕他似的。

If accepted for this post, you will be informed within a week. 如果你被接受擔任這個職務，將在一禮拜內給你通知。

Once exposed to light, the film will be damaged and get useless. 一旦曝光，膠卷就要被損壞而不能用了。

The school rules state that no child shall be allowed out of the school during the day, unless accompanied by an adult. 校規規定，除非有成年人的陪同，孩子在白天不允許出學校。

Grill for 15 to 20 minutes, turning occasionally until cooked. 燒烤15分鐘至20分鐘，不時翻轉直到燒熟為止。

When asked for your views about your current job, on no account must you be negative about it. 被問及你對自己目前工作的看法時，無論如何不要流露出消極情緒。

五、省略后只由wh-詞來代替整個從句

有些由when, where, who, which, how等引導的從句，如果上文的語境清楚，可以從句省略，而只保留wh-詞。如：

I’d like to help in some way, but I’m not sure how. 我想幫點忙，但不知道該怎么做。

Be very clear about what jobs should be completed, and by when. 對哪些工作應該要完成和應該什么時候完成必須非常明確。

I’ll call you ahead of time to fix up exactly when and where. 我會提前打電話給你，確定時間和地點。

I’ve left my keys somewhere and I don’t know where. 我把鑰匙放在某個地方了，但不知道是哪個地方。

Miranda was sure it was one of them, but was not sure which. 米蘭達確定是其中的一個，但不敢肯定是哪一個。

It’s either Spanish or Portuguese that she speaks, but I’ve forgotten which. 她說的要么是西班牙語，要么是葡萄牙語，但我忘記是哪一種了。

 “Who told you?” “Oh, somebody or other, I’ve forgotten who.” “誰告訴你的?”“啊，有個人，我忘了是誰了。”

He’s angry with me and I don’t know why. 他生我的氣了，但我不知道是為什么。

She gets periodic headaches, but she doesn’t know why. 她時不時地感到頭疼，但不知道為什么。

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