I don't think you need to know these differences if you want to teach in kindergarten / middleschool

Especially because your english class (in some cases) is secondary to the Chinese teacher whose been given the job to do just that - teach grammar.

Else, 说中文吗？Then- you can explain grammar to them better. I don't see a 5 year old Chinese comprehending an english explanation about grammar. It'd be more effective for them to hear it in Chinese.