<p>I teach elementary school. The kids who end up as adults making these mistakes can barely recognize their letters in 2nd grade. You let me know when a good time to teach them grammar would be. We have a rememediation program in place, and one of the scripted questions I had to ask them was “to whom (something something)” and they looked at me like I had 5 heads even after I explained it until I rephrased it putting “who…to?”. Kids will not write correctly if that is not how they speak. The things on the list are things you cannot hear the difference between. (between which…? haha). You can try and teach them at a “young age” but if they can’t even read the words or spell simpler words than that then it’s not going to do much good. I got most of my grammar education in middle school and it turned out just fine for me. Students have to learn grammar for their writing SAT as well.</p>