AlpheccaStars, thank you. I use the present perfect tense at 9:30pm because I point out the result (the dishes are clean, Mary doesn't need to wash the dishes.) Suppose that the dishes are dirty, Mary needs to wash them, I would use past tense now.
) You can say either of these: Mary has washed the dishes. Mary washed the dishes. We use both, practically interchangeably in the situation you described..
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Chan Kelvin because I point out the result (the dishes are clean, Mary doesn't need to wash the dishes.)
You can say either of these:
Mary has washed the dishes.
Mary washed the dishes.
We use both, practically interchangeably in the situation you described..
Chan KelvinSuppose that the dishes are dirty, Mary