Thank you for cleaning the house, but you needn't/shouldn't have done it. I was going to do it later.
Is there a difference between them? Thank you.
In my opinion, needn't is more appropriate than shouldn't because shouldn't subtly implies that cleaning the house was somehow wrong or inappropriate: You should not have done it. Needn't, in contrast, communicates that the cleaning wasn't necessary: You need not have done it.
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In my opinion, needn't is more appropriate than shouldn't because shouldn't subtly implies that cleaning the house was somehow wrong or inappropriate: You should not have done it.
Needn't, in contrast, communicates that the cleaning wasn't necessary: You need not have done it.