爱华网once有一次;一旦;曾经等意思，那么你知道once的用法吗?下面跟着小编一起来学习一下，希望对大家的学习有所帮助!
once的用法大全：once的用法1：once用作连词时可引导时间状语从句和条件状语从句。用于前者时意为“一旦…就…”,所引导的从句多很短; 用于后者时意为“只要”,这种条件从句似带有时间条件的含意。
once的用法2：once引导的从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.
这里曾是一个有钱贵族的宅邸。
2. We tend to meet up for lunch once a week.
我们往往每周共进一次午餐。
3. He once told an interviewer that he didn't even like rock music.
他曾告诉一位采访者，他甚至都不喜欢摇滚乐。
4. Once wholesale prices are deregulated, consumer prices will also rise.
一旦批发价格放开，零售价格也会随之上涨。
5. He took off at once and headed back to the motel.
他立刻离开，回到汽车旅馆。
6. The car passed over the body twice, once backward and then forward.
那辆车把那人来回轧了两次，先是倒着轧的，再是往前开着轧的。
7. I lived there once myself, before I got married.
我结婚前曾独自在那儿住过。
8. "Have they been to visit you yet?" — "Just the once, yeah."
“他们来看过你吗?”——“来过,就一次.”
9. He once again raised his baton and brought in the brass.
他再次举起指挥棒，让铜管乐部加入进来。
10. I saw her in a towering rage only once.
我只有一次见过她大发雷霆。
11. I met him only the once, and that was enough.
我就见过他那一次，那就让我受够了。
12. Any escape, once it's detected, sets off the alarm.
一旦发现有泄漏，警报就会响起来。
13. She started once again on the steep upward climb.
她又开始沿着陡峭的山路往上爬。
14. Remove from the heat, add the parsley, toss and serve at once.
端离炉子，加上欧芹，颠起翻面后就立刻上桌。
15. Once he knew his father's name, finding his whereabouts proved surprisingly easy.
一旦他知道了父亲的名字，查找他父亲的下落就变得出奇地容易。
