Synonyms of 'sooner'
I thought she would have recovered sooner.
They would sooner die than stay in London.
I'd rather stay at home than fight against the holiday crowds.
usage note:When is sometimes used instead of than after no sooner, but this use is generally regarded as incorrect: no sooner had he arrived than (not when) the telephone rang.
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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 end of a clause. Some speakers of American English use already with the simple past tense of the verb instead of a perfect tense.
They've spent nearly a billion dollars on it already.
You use before when you are talking about time. For example, if something happened the day before a particular date or event, it happened during the previous day.
The war had ended only a month or so before.
Thesaurus for sooner from the Collins English Thesaurus
Sooner is the comparative of → soon .