This is the 145th most frequent Japanese word.
もう
"もう" means "already," "soon," "anymore," or "now," depending on context.
In this sentence, 'もう' means 'already', indicating the completion of an action by this point in time.
もう宿題は終わりました。
I have already finished my homework.
Here, 'もう' is used to mean 'now', emphasizing the urgency or immediacy of the action.
もう行かないといけません。
I have to go now.
In this case, 'もう' signifies 'anymore', clarifying a change in behavior or actions.