1.Only 副詞（或介詞短語、狀語從句等狀語成分）位于句首是，句子要進行主謂部分倒裝：

Only then did I realize that the man was blind. 隻是到了那時我才意識到他是盲人。

Only after many setbacks was success achieved.

幾經周折才告成功。

Only after a year of friendly discussion did Ms ． Garza finally say yes ．

經過一年的友好讨論,加爾紮女士終于答應了。

Only in the reading-room can you find him. 你隻有在閱覽室才能找到他。

Only you study hard can you get good results.

隻有肯努力，才能得到好的學習成績。

《漢英大詞典》

Only when I worked as an interpreter did I realize how important it was to pratise speaking English.

隻有當我做翻譯的時候，我才意識到練習說英語是多麼重要。

Only after she died was I able to appreciate her. 隻有到她死後我才認識到她的價值。

Only when one loses freedom does one know its value. 一個人隻有在失去自由後才知道自由的可貴。

注意，only 狀語從句時，主謂部分倒裝的結構發生在主句裡，這個狀語從句還是正常語序。

Only when the telescope is inclined at an angle of thirty degrees can you see that star.

隻有當這架望遠鏡以30度角傾斜時，你才能看到那顆星星。

《外研社英語同義詞辨析詞典》

Only when each logical step has been checked by other mathematicians will the proof be accepted.

隻有每一邏輯步驟都被其他數學家驗證之後，證明才能成立。

Only after much persuasion from Ellis had she agreed to hold a show at all

埃利斯勸了她半天後她才同意辦一場展覽。

Only after countless rewrites did John consider the script ready.

隻有經過了無數次修改後，約翰才認為劇本寫好了。

以上3例句摘自《柯林斯高階英漢雙解學習詞典》

2. 若位于句首的不是only 狀語，而是 only 賓語等，則通常無需倒裝(但有時也可以倒裝)：

Only the teachers are allowed to use this room.

隻有老師才能使用這個房間。(only 主語，不倒裝)

Only five men were hurt in the accident．

隻有5人在這次事故中受傷。(only 主語，不倒裝)

Only a policeman the children saw in the street.

孩子們在街上隻看到一個警察。(only 賓語，不倒裝)

Only one more point will I make. 我隻再說明一點。(only 賓語，倒裝)

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