I've seen "not to worry" used to mean like "Don't worry" sometimes in conversation, so I think I could invent some similar expressions like that like

  1. Not to mind. It gonna be all right. (meaning Don't mind. It gonna be all right.)

  2. Not to be sad. She wouldn't die of cancer like your father. (meaning Don't be sad. She wouldn't die of cancer like your father.)

  3. Not to run at home! (meaning Don't run at home!)

To know whether they sound natural, I asked native speakers about these sentences, but well, they all answered that although "not to worry" sounds natural, those expressions I invented sound very unnatural.

I guess this is just because they are not such expressions in use even though they do make sense, but I have no ideas specifically why.

  • 1
    It's a fluke that many idioms end up being used. Because they are used, they sound natural. If I turn off the part of my brain that blindly accepts idioms, not to worry also sounds wrong. It only sounds natural because it is used; the other expressions you made up aren't. It's as simple as that. I have no way of explaining why some things have come to be used and others haven't. The real question is not why your invented expressions sound unnatural, but why not to worry sounds natural. Because those three words on their own—without further context—violate common syntax. – Jason Bassford May 22 at 8:00

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