The auxiliary verb comes before other verbs. will (auxiliary) help (main verb) don't (auxiliary) know (main verb) You are usually safe putting the adverb after the auxiliary (first verb). will definitely help don't even know If there's no auxiliary verb, put the adverb before the main verb.
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AnonymousPlease describe the rule of grammar regarding thisIt's called the rule of adverb positioning. (It's not exactly a rule, though.)
Anonymous But I saw some people use "It definitely will help John or John surely will ask. And some people use: It will definitely help or John will surely ask. So which one is better to use/prefer"definitely" is a sentential adverb. That means, more or less, that it can be paraphrased as It is definitely the case that (it will help John). It modifie