Wrong!
One parent can never get away from the fact that their kid will one day experience a world of grammatical errors. Truth is, almost everyone had this kind of problem. I know I had one but the best thing that my mom did to help me out was she started correcting me in a manner that most parents do not.
I once had this problem with past tense. Right after having dinner, I would often say, “I eated much already! Can’t eat fruits anymore.” My mom would then answer, “Yes me too! I ate much already.” Correcting me this way make things much better. Some would even repeat their child’s mistakes which I find really unhelpful.
Try correcting them young. Do not let them get accustumed to this kind of sentences.