conditional perfect - Right way to use "Cannot but help"


A relatively straightforward use of "cannot but help" is along the lines of



When you use ... you cannot but help notice...



No issues there. However, I would like to say



If you have used ... (right form of) you cannot but help notice



I could simply duck the issue and write



If you have used ... you will have noticed



but not being able to work in cannot but help is bothering me. I'd be most grateful to anyone who might be able to tell me how it could be used with "If you have..."



Answer



I think you are mistaken. The correct form of the expression is "cannot help but".


A correct sentence would be: "If you have used the soap, you cannot have helped but notice the odor it has."


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