我在语法方面有些问题可以用 "I have some issues with grammar." 来表示。
"I have some issues with grammar." 中的 "have some issues" 是一个习语，意思是 "有一些问题"。 "With grammar" 是一个介词短语，意思是 "与语法相关"。
例句：
I have some issues with grammar, so I need to study it more. (我在语法方面有些问题，所以我需要再多学习一点。)
I think I have some issues with grammar, can you help me? (我觉得我在语法方面有些问题，你能帮帮我吗？)
I'm having some issues with grammar in my writing, can you give me some feedback? (我在写作中有些语法问题，你能给我一些反馈吗？)