gram‧mar S3 W3 / ɡræmə $ -ər / 名词

1 [不可数名词] the rules by which words change their forms and are combined into sentences, or the study or use of these rules :

Check your spelling and grammar.

the rules of English grammar

2 [可数名词] a particular description of grammar or a book that describes grammar rules :

A dictionary lists the words, a grammar states the rules.