HOW CAN I TEACH GRAMMER FOR CHILDREN?

Did you say gremmar?

just try to use their colleagues' sentences and mistakes to build on.
working with little children is really challenging and you have to address their interests.

you can try to use their mother language grammar.as you start with simple facts of grammar use cards or pictures even you can use yourself as amodel

First you have to have the ability how to think as a child .
In other words , you have to know how children see things , perceive things , the angle from which they arrive at any conclusion or result .
You'd be surprised how children construe & interpret things .
To them it's a matter of black & white , of course in a good positive way that's consistent with their innocent outlook on themselves , others & life in general .
Now once you've well established that , then you can embark on the process of teaching them , in a fun & game like manner .
You have to start with the basics in the sense that you try your level best to make them able to conceptualize & grasp what it is that you're trying to bring to them .
These basics include , but not limited to , the idea or the rule that any correct grammar requires correct words , & , correct phrases , & , how you assign the former to the latter , & , hence , the sought-after correct grammar .
After that , it's a smooth sailing , assuming that the basics are adhered to & well built on every step of the way .
Then you can work your way up to the top ( Excellent English ) by simply following up & building on what you've already achieved in a gradual & incremental way that has patience & vision well incorporated into it .