The grammar is appalling.

So we paid attention to a particular grammatical rule, past tense conjugation.

My parents English, though tinged with the musicality and characteristic accent of the Caribbean, was always very well spoken, with excellent grammar and vocabulary.

The teacher may describe a rule in the native language to explain a grammatical structure.

Shin saw only one book, a Korean grammar in the hands of his teacher.

Minor proof reading changes have also been made to correct grammar, spelling and punctuation in the texts.

So, a problem in explaining how children learn language, a problem in teaching language to adults so that they don't make grammatical errors, and a problem in programming computers to use language is which verbs go in which constructions.

Probably, according to what many linguists believe, fully modern language, syntactic language subject, verb, object that we use to convey complex ideas, like I'm doing now, appeared around that time.

So, a problem in explaining how children learn language, a problem in teaching language to adults so that they don't make grammatical errors, and a problem in programming computers to use language is which verbs go in which constructions.