Except for a few grammatical mistakes, this composition of yours is well written. 除了几处语法错误之外,你这篇作文写得不错。
Native speakers can distinguish between grammatical and ungrammatical sentences even when they have never heard particular combinations before. 母语使用者可以分辨符合语法规则和不符合语法规则的句子,即使他们以前从没有听过这些特定的词语组合。
...a new test to determine whether students can write grammatical English. …一项测定学生能否写出合乎语法的英语的新测试。
Should the teacher present grammatical rules to students? 老师应该向学生讲解语法规则吗?