もう～たAlready completed
もう with a past affirmative verb says that an expected action or change has already happened. In natural English, this is often translated with “already” or a perfect form such as “has finished.”
What it tells the listener
もう presents the event as complete before the time being discussed, usually now. It works best when the action has a clear endpoint, such as finishing homework, buying a ticket, or reaching a new age.
Actions and changes already completed
The same pattern works for completed actions and for changes that have already occurred.
Questions often use “yet” in English
In a question, もう asks whether the expected event has happened by now. English usually uses “yet,” even though affirmative answers often use “already.”
Already vs. not yet
もう～た gives a completed answer. By contrast, まだ～ていない says that the same expected event has not happened yet.
More examples
朝ご飯はもう食べました。
I’ve already eaten breakfast.
Analyze申込書はもう出しました。
I’ve submitted the application form.
Analyze荷物はもう届きましたか。
Has the package arrived yet?
Analyzeその映画はもう見た。
I’ve already seen that movie.
Analyze春が来て、雪はもう溶けました。
Spring has arrived, and the snow has already melted.
Analyze田中さんはもう帰りました。
Tanaka has already gone home.
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