in grammar 在语法方面,语法上的. eg: A specialist in grammar.语法专家,语言学专家 A thorough grounding in grammar 对基础语法的透彻教授 She is weak in grammar. 她语法很差. You`ve slipped in yur grammar. 你犯了一个语法错误. on grammar 关于语法的, They place a great deal of importance on correct grammar 他们非常重视语法的正确性