英语造句，急急急急急～!!!!!

I want to help you better understand the grammar.
he helps his mother better understand the problem.
You should have helped me better understand the rule.
I will help you better understand the law sometime nextweek.

I am keen on English.
He is keen on Geology.
I was keen on math when I was a little boy.
She will be keen on cauculation after this lesson.

Ants is diffrent from worms.
She is diffrent from Mary.
I can not believe that John have much in common with me now for we were quite diffrent before.
It would be diffrent from the result if we have optimized the new plan.