once有一次;一旦;曾經等意思，那么你知道once的用法嗎?下面跟著學習啦小編一起來學習一下，希望對大家的學習有所幫助!

　　once的用法大全：

　　once的用法1：once用作連詞時可引導時間狀語從句和條件狀語從句。用于前者時意為“一旦…就…”,所引導的從句多很短; 用于后者時意為“只要”,這種條件從句似帶有時間條件的含意。

　　once的用法2：once引導的從句中有些部分可以省略。

　　once的用法例句：

　　1. It had once been the home of a wealthy nobleman.

　　這里曾是一個有錢貴族的宅邸。

　　2. We tend to meet up for lunch once a week.

　　我們往往每周共進一次午餐。

　　3. He once told an interviewer that he didn't even like rock music.

　　他曾告訴一位采訪者，他甚至都不喜歡搖滾樂。

　　4. Once wholesale prices are deregulated, consumer prices will also rise.

　　一旦批發(fā)價格放開，零售價格也會隨之上漲。

　　5. He took off at once and headed back to the motel.

　　他立刻離開，回到汽車旅館。

　　6. The car passed over the body twice, once backward and then forward.

　　那輛車把那人來回軋了兩次，先是倒著軋的，再是往前開著軋的。

　　7. I lived there once myself, before I got married.

　　我結婚前曾獨自在那兒住過。

　　8. "Have they been to visit you yet?" — "Just the once, yeah."

　　“他們來看過你嗎?”——“來過,就一次.”

　　9. He once again raised his baton and brought in the brass.

　　他再次舉起指揮棒，讓銅管樂部加入進來。

　　10. I saw her in a towering rage only once.

　　我只有一次見過她大發(fā)雷霆。

　　11. I met him only the once, and that was enough.

　　我就見過他那一次，那就讓我受夠了。

　　12. Any escape, once it's detected, sets off the alarm.

　　一旦發(fā)現(xiàn)有泄漏，警報就會響起來。

　　13. She started once again on the steep upward climb.

　　她又開始沿著陡峭的山路往上爬。

　　14. Remove from the heat, add the parsley, toss and serve at once.

　　端離爐子，加上歐芹，顛起翻面后就立刻上桌。

　　15. Once he knew his father's name, finding his whereabouts proved surprisingly easy.

　　一旦他知道了父親的名字，查找他父親的下落就變得出奇地容易。