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If someone has done something before, they have done it on a previous occasion. If someone has not done something before, they have never done it.
I've been here before.
Video: pronunciation of 'already'
already 的词库—— 柯林斯 英语词库
You use already to show that something has happened , or that something had happened before the moment you are referring to. Speakers of British English use already with a verb in a perfect tense , putting it after 'have', 'has', or 'had', or at the ...