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.

You use already to show that a situation exists at this present moment or that it exists at an earlier time than expected. You use already after the verb 'be' or an auxiliary verb, or before a verb if there is no auxiliary. When you want add emphasis, you can put already at the beginning of a sentence.