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.
" But, depending on the tone of voice it is delivered in, "needn't" can sound appreciative, or dismissive and unappreciative, and "shouldn't" can sound humble and surprised, or admonishing.
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Here they have the same meaning: "It wasn't necessary for you to clean the house." But, depending on the tone of voice it is delivered in, "needn't" can sound appreciative, or dismissive and unappreciative, and "shouldn't" can sound humble and surprised, or admonishing.