Is it possible to use already without have/had in front?
I already eat/ate
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Yes, it's fine to use "already" without using "have" or "had."
With past tense, it refers to a specific instance:
Person A: Want to get pizza for dinner?
Person B: No thanks, I already ate.
With present tense, it refers to a general habit:
Person A: You need to improve your diet.
Person B: No, I don't! I already eat lots of fruit and vegetables.