問問關於英文tense 問題

You can, but you need to add 'the'.

"I have just washed the dishes " / "I have already washed the dishes " will be better

"I have just washed the dishes " = 我剛剛洗完碟

"I have already washed the dishes " = 我已經洗完碟

This is the millionth time the poster has asked the same question. He uses the wrong expression every time and keeps asking if there is a problem with his expression. I firmly believe he is suffering from some kind of compulsive behaviour problem.

當一洗完碟後立即講:
~ I have washed dishes. ( 可以用現在完成式，但錯誤使用動詞)
應該說: I have just finished washing the dishes.

如果你阿媽問你: What have you done the whole morning?
你才可以說: I have washed the dishes.

I have just washed dishes.
I have already washed the dishes.

首先，你應該說 'I have washed THE dishes'. 接下來，如果你說“I wash dishes'' (現在完成式)，這意味著你的工作是洗碗. So is wrong.