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哪些從屬連詞后面可以直接用于過去分詞
根據(jù)句子意思的需要，有時可以在過去分詞前加上一個合適的連詞。到底哪些從屬連詞后面可以直接用于過去分詞呢？比較常用的有：
■although
Although exhausted by the climb, he continued his journey. 他雖然爬得很累，但他仍繼續(xù)前進(jìn)。
Although never married, they lived together as husband and wife for fifty years. 雖然從未結(jié)婚，但他們像夫妻一樣在一起生活了50多年。
■as
It usually happens as described above. 情況通常就像上面描述的那樣發(fā)生了。
Inflation, as measured by the retail price index, is expected to drop. 正如零售物價指數(shù)所顯示的，預(yù)期通脹下降。
■as if
The lad started as if awakened from some dream. 這小伙子一驚，仿佛從夢中驚醒似的。
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。
■as though / as if
She smiled, as though solaced by the memory. 她笑了，仿佛在往事的回憶中得到了安慰。
■if
If accepted for this post, you will be informed within a week. 如果你被接受擔(dān)任這個職務(wù)，將在一禮拜內(nèi)給你通知。
The law could arrest the development of good research if applied prematurely. 如果草率施行，該法律將會阻滯高質(zhì)量研究的進(jìn)展。
He said they did not want war—but if attacked they would fight to the death. 他說他們不希望有戰(zhàn)爭——但一旦遭到攻擊，定會戰(zhàn)斗到底。
Condoms are an effective method of birth control if used with care. 如果使用得當(dāng)，避孕套是很有效的避孕手段。
■once
Once exposed to light, the film will be damaged and get useless.(= 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。
Once appointed supreme commander, he took the stem measures expected of him. 他一被任命為最高統(tǒng)帥之后，果然就采取了嚴(yán)厲的措施。
■though
I went on talking, though continually interrupted by Dassel. 我繼續(xù)往下談，盡管不斷被杜塞爾打斷。
■unless
The population will grow without limit unless kept in check by starvation. 人口如果不受到饑餓的抑制，將會無節(jié)制地增長。
manuscripts cannot be returned unless accompanied by a self-addressed envelope. 除非附有寫明自己地址的信封，否則原稿是不能退的。
Unless otherwise specified, all fields have a maximum length of 20 characters. 每個字段的最大長度是20 個字符，除非另作說明。
■until
The virus remains dormant in nerve tissue until activated. 病毒潛伏于神經(jīng)組織里直到被激活。
Grill for 15 to 20 minutes, turning occasionally until cooked. 燒烤15分鐘至20分鐘，不時翻轉(zhuǎn)直到燒熟為止。
All the photographs in this book, unless otherwise stated, date from the 1950s. 本書所有照片，除非另有說明，都攝于20 世紀(jì)50 年代。
■when
When asked, she confirmed that she was going to retire. 有人問她時，她肯定了她將要退休。
He was reminded of his duty to speak the truth when questioned in court. 他被提醒在回答法庭問題時，有責(zé)任講真話。
The tallest buildings in
■where
The program will prompt you to enter data where required. 這個程序在必要時提醒你輸入數(shù)據(jù)。
■while
While locked up in prison, she wrote her first novel. 在獄中寫出了第一部小說。
While flattered I must decline to accept. 雖然我感到高興，我卻不能不婉言謝絕。
The couple took good care of the baby while occupied by their work. 這對夫婦一邊工作，一邊很好地照顧著嬰兒。
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