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1. “連詞+省略結構”通常可視為一種緊縮的狀語從句，即認為是省略了從句的主語（與主句主語一致）和主語后的動詞be。如：
Look out for car’s when (your are) crossing the street. 過街時注意車輛。
He acted as if (he was) certain of success. 他的舉止就像一定會成功一樣。
有時可視為省略了it is(其中的it并非主句主語)。如：
lf (it is) possible, please let me know by this evening. 如果可能的話，請在今晚以前告訴我。
Where (it is) necessary, improvements will be made. 哪兒需要，就在哪兒改進。
2. 并不是所有的狀語從句都可以用以上辦法來緊縮的，如原因從句就不能用這種辦法來處理。
3. 與上面提到的省略結構相似且經常在高考中出現的還有if not…這一種形式。如：
His pronunciation, if not good, is at least tolerable. 他的發音如果說不算好，也還過得去。
If not today, tomorrow I’m sure you’ll get an answer. 如果今天得不到回信，明天準能得到。
Usually, if not always, we write “cannot” as one word. 我們即使不總是如此，也通常是把cannot作為一個詞來寫的。
This is one of the oldest buildings in town, if not the oldest. 這是城里最古老的房屋之一，如果不是最古老的話。
請看下現兩道高考題：
1. We all know that, ____B___, the situation will get worse.
A. not if dealt carefully with
B. if not carefully dealt with
C. if dealt not carefully with
D. not if carefully dealt with
2. Though he started late, Mr. Guo played the piano as well as, if ___A___, Miss Liu.
A. not better than
B. not better
C. no better than
D. better
【省略句短訓】
01. When _________ the tunnel will be the longest in the world.
A. complete B. completing C. having completed D. completed
02. Although _________ before the war, the engine is still in perfect order.
A. building B. built C. to be building D. to have been built
03. Unless _________, this law will make life difficult for farmers.
A. to change B. changing C. changed D. to be changed
04. Do not leave the building unless _________ to do so.
A. to instruct B. instructed C. being instructed D. instructing
05. When _________ if he wanted anything else, he just shook his head.
A. asking B. to ask C. asked D. to be asked
06. If _________ for this post, you will be informed within a week.
A. accepting B. to accept C. accepted D. to be accepted
07. These working conditions are unhealthy, _________ extremely dangerous.
A. if so B. if not C. so if D. not if
08. Her needs are just as important as yours, _________ so.
A. if not more B. if more not C. more not if D. not if more
09. Where _________ necessary, improvements will be made.
A. they are B. we are C. are D. 不填
10. She hurried out of the room, as if _________ angry.
A. was B. it was C. got D. 不填
11. _________ paying by credit card, please pay in cash.
A. Unless B. Until C. Since D. Before
12. Although _________ ten years ago, the house still looks new.
A. building B. built C. to build D. having built
13. By 1977 things were beginning to improve, _________ quickly enough.
A. even if not B. even not if C. if not even D. if even not
【參考答案】01—05 DBCBC 06—10 CBADD 11—13 ABA
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