have/has done sth before
常与现在完成时连用，表示到目前为止曾有过的经历，before 放在句末。
I have visited this city before.
我以前来过这座城市。
以前；之前；先前
在前面；在前方；在较早的时间；在时间上更早；之前；在前面或前方；在前
at an earlier time; previously
在较早的时间
At an earlier time.
在时间上更早；之前
earlier in time; previously
在前面或前方
at or in the front
I have seen that movie before.
我以前看过那部电影。
用法提示：before作为副词，表示'以前'，修饰动词seen。
AI contextual example
He walked before me in the line.
他在队伍中走在我前面。
用法提示：before作为副词，表示'在前面'，描述位置。
AI contextual example
Have you been to London before?
你以前去过伦敦吗？
用法提示：before作为副词，表示'以前'，用于现在完成时。
AI contextual example
常与现在完成时连用，表示到目前为止曾有过的经历，before 放在句末。
I have visited this city before.
我以前来过这座城市。
与过去完成时连用，指过去某一时间点之前的那一天、那一周、那一年等。
She had moved to Beijing the year before.
她前一年搬到了北京。
固定说法，意为“和以前一样”，多放在句末。
The schedule stays as before.
日程安排和以前一样。
grammar · medium
易错句子I moved to Shanghai two years before.
正确表达I moved to Shanghai two years ago.
表示“距现在多久以前”时，英语用 ago 并搭配一般过去时，不用 before。before 表示“在另一个过去时间点之前”，需要有一个过去的参照点（例如间接引语 He said he had moved there two years before.）。这里只是与说话时刻对比，所以要用 two years ago。
grammar · medium
易错句子I before have seen this film.
正确表达I have seen this film before.
汉语的“以前”习惯放在主语之后、动词之前，但英语副词 before 表示“以前”时通常位于句末（也可置于句首，如 Before, I had seen it.），不能插在主语和助动词之间。因此应说 I have seen this film before。
grammar · medium
易错句子—Where is Tom? —He went out before.
正确表达—Where is Tom? —He just went out.
汉语“刚才”指“刚刚发生”，英语要用 just (now)、a moment ago 等；before 表示“在更早的某个时间”，隐含与另一个过去时间的比较，不能表示“刚刚”。所以这里应说 He just went out。
不久
Before long, the sun set and the stars came out.
不久，太阳落山，星星出来了。
和以前一样
Everything was quiet as before.
一切都和以前一样安静。
前一天
I had seen him the day before.
我前一天见过他。
在此以前
I have never heard that before now.
我以前从未听说过这个。
从未有过
Never before had she felt so happy.
她从未感到如此幸福。
在那之前
转眼之间；很快
If you keep saving, before you know it, you'll have enough for a car.
如果你继续存钱，转眼之间你就会攒够买车的钱。
不久以后
Before long, the sun set and the stars came out.
不久以后，太阳落山，星星出来了。
我们眼前无所不有，我们眼前一无所有。
From Charles Dickens' novel 'A Tale of Two Cities', this line contrasts extremes and is frequently quoted in popular culture.
来自查尔斯·狄更斯的小说《双城记》，这句话对比极端情况，经常在流行文化中被引用。
在你离开之前，是不是有些话我本可以说，让你的心跳更安稳？
Lyric from Lewis Capaldi's hit song 'Before You Go', expressing regret over a lost relationship.
路易斯·卡帕尔迪的热门歌曲《Before You Go》的歌词，表达对失去关系的遗憾。
Choose the next layer that will help you use before with more confidence.
Recommended next
Preparing Confusing words
Complete this area with confusing words.
More ways to explore
Includes Synonyms & Antonyms
Expand your vocabulary with synonyms and antonyms.
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.
We must finish the work before then.
我们必须在那个时间之前完成工作。