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This will depend on whether he"s suitable for the job. This will depover on whether he"s suitable for the job or not.

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This will depkết thúc on whether or not he"s suitable for the job. It is still not defined whether we"re following that approach. It is still not defined whether we"re following that approach or not. It is still not defined whether or not we"re following that approach. "Or not" doesn"t really seem lớn be needed to lớn complement "whether". Why vì people use it then? Is it redundancy and nothing more? Or is it for emphasis? Or are there cases when "or not" is required for the sentence khổng lồ be grammatical?



As Henry Higgins observed in Pygmallion, the best grammarians are often those who learned in school as immigrants. My parents, who were first-generation Americans in the early 20th century, learned grammar in NYC public schools meticulously. They insisted "whether or not" is proper usage, period. Over time, language evolves or erodes and the rules change, which really means there are no authorities. I believe sầu many changes are driven by relatively poorly educated TV personalities misusing words, which then become comtháng usage. Someone once said, "C students rule the world."
The addition of the "or not" is neither logically nor grammatically required. I think it"s often used conversationally for emphasis. I definitely wouldn"t use it in writing myself.


JohnT I think whether emphasizes a dichotomy in which one option is imminent, though the option may not be known. If emphasizes the conditional nature of the matter.
It"s worth pointing out that, etymologically speaking, the roots of whether are which/either of two. It"s inherently a "binary choice" word, so whereas "I don"t know whether it be fish or fowl" is fine, "I don"t know whether it be fish or fowl or good red herring" isn"t really grammatical. Which is not khổng lồ say people never use that extended form - but it does sometimes attract criticism.

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With "unary choice" forms such as "I don"t know whether I like it", the alternative sầu ("I don"t like it") can invariably be shortened to "or not" - or simply discarded completely, since it"s implicit anyway.

Possibly some will say if only one choice is presented, you should use "if" rather than "whether", but skimming through written instances of "Tell me whether" suggests that most people have always been quite relaxed on that point.

TL;DR: "or not" is never required if the alternative is a simple negation of the stated proposition, but an "or" clause is required in, say, "You must choose whether lớn write novels or poems" (presupposing that writing, for example, software is not an option currently on offer).