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For example

Do you doubt whether/that he will help you or not?

Which is the correct grammar form?

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1 Answer 1

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Do you doubt whether/that he will help you or not? Which is the correct grammar form?


help you or not? the use of or not is superfluous as you have already formed the question earlier in the sentence.

"Do you doubt whether he will help you" means

Do you doubt if he will help you ..... Do you doubt or not, (that) he will help you


Do you doubt that he will help you? means what it says.


To Answer your question both forms can be used. However the combination of doubt and whether is preferable in a interrogative sentence (see definition below).

Do you doubt or not (that) he will help you. ....or not has an interrogative meaning and can be use to ask about alternatives.


whether conjunction (used especially in reporting questions and expressing doubts) if, or not:

Or not We can use or not in questions to ask about a range of possibilities:

All references Cambridge English Dictionary

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