If you want to teach a 3-yr old child essay writing then there are no steps. you are going to  fail however sharp the child is and however desperate you are. same will be the outcome with grammar. if you want to teach him/her the alphabets, (1) take an english alphabet book and start with the nursery rhyme that goes a,b,c,d... so that he/she gets interested (2)then teach him word formation, i.e., a for apple, b for ball,... etc (3) give him some exercises on what he learnt.