She was marked down because of poor grammar.

她因语法不好被扣了分。

《牛津词典》

Each week I went through half-remembered phrases, getting bogged down in the intricate grammar and impossible inflections.

每周我都复习那些记不大清的词组，艰难地整理复杂的语法和纷繁的屈折。

youdao

You need not get bogged down in grammar and drills. You will be surprised how fast you learn when you are enjoying yourself.

你不必拘泥于语法和训练，你会吃惊的发现你愉快的时候学的是多么得快。

youdao

I don't grade down for grammar.

但我不会因为语法错误给他们低分。

与哲学系教授 - SpeakingMax英语口语达人

Non-grammar school children worried that grammar school pupils looked down on them and thought they were stupid.

BBC: Northern Ireland