grammatical rule
rule of grammar

What she had were word lists and grammatical rules of corn- position.

How long does it take to refer to a grammatical rule?

It does this by following the grammatical rules of syntax.

Care has been taken to ensure that getting the right answer requires a genuine understanding of the grammatical rules.

They followed the same grammatical rules as the words in the other two vocabularies.

The child does start with general grammatical rules that determine linguistic properties.

The individual words make sense and are arranged according to proper grammatical rules, yet the result is nonsense.

A child acquiring language must abstract away grammatical rules based on the input which they hear.

Waterstones are not going to court to change grammatical rules.

Most people "know" many of the grammatical rules they use not through studying grammar but by listening and reading.