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What is the basis of grammaticality?

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Accepted usage. Grammar of any language is based on how a native speaker uses a particular language to communicate. From sounds to mechanics all elements must be acceptable.
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What is grammatical accuracy?

Grammatical accuracy is obtained when each word in a sentence represents the meaning the author intents to convey and are arrange in the correct order.

What is grammatical competence?

Grammatical competence is the ability   1. to recognize and produce the distinctive grammatical structures of a language and to use them effectively in communication.  2

Is had no grammatically correct?

You may say "I had no pencil," or you may say "I did not have any pencils" - whichever feels more natural to you. "Had no" would be used when speaking of a singular subject

Which is grammatically correct--if I was or if I were?

Both are correct, with different meaning. If I was introduces a real condition in the past, and if I were introduces an unreal condition in the present. For example: If I was

If you were me or if you were I which is grammatically correct?

You're using the predicate nominative, so the pronoun should technically be in the nominative case (i.e. "If you were I"), but English speakers almost universally say and writ

Is you and me grammatically correct?

The correct grammar is YOU AND I if used as a subject, e.g. ""You & I will have a jolly good time". Correct grammar requires YOU AND ME if used as an object, e.g. "This is jus

Which is grammatically correct What I did is or what I did was?

"What I did is" is correct. It does not matter that the doing occurred in the past: it is still what I did, and will always be what I did. The answer below represents a very p