They only happen as a result of the parser applying some grammar rule.

Following the interpreter pattern there is a class for each grammar rule.

Even though the dialects of English use different words or word order, they still have grammar rules.

Interjections are words that do not fit normal grammar rules.

The methods have in common that they associate grammar rules with a probability.

The grammar rules of different sign languages are similar to each other, but they aren't the same.

It is not to be expected that each sentence written will obey grammar rules.

Our focus is more on actual communication than grammar rules.

A dictionary has been developed along with grammar rules and bible portions.

In recent years, some groups have tried to come up with a spelling dictionary and grammar rules but there is still no official version.