This amounts to bad English grammar advice

It’s Microsoft Word’s grammar checker’s turn today. It suggested turning this amounts to either this amount or these amounts, and this weighs to either this weigh or these weighs. But this amounts was in a context like This amounts to a convincing argument for the plaintiff, and this weighs was in a context like This weighs heavily in favour of the respondent. 

Amount can be a noun, in which case we must use either this amount is or these amounts are, but can also be a verb (usually followed by to), in which case we must use either this (argument) amounts to or these (arguments) amount to. (I don’t know if the noun or verb came first.)

Weigh can only be a verb; the corresponding noun is weight. We can only say this weight is or these weights are, and this (submission) weighs and these (submissions) weigh. Microsoft’s suggestions of this weigh and these weighs are just not English grammar as I know it. 

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