I understand your pain... As for the grammar Nazi... check yours before you troll someone else. Dear is capitalized along with some other mistakes you've made.
He understands English perfectly fine... knowing how to last hit has nothing to do with what language you speak. Also, play roles that majorly impact the game like jungle, mid, top. Jungle controls kills in the game but well played ganks. Top controls game towards the end depending on cs/champ. Mid controls map in general. Also provide wards for team more wards more kills and less deaths.
Also, watch pro players play and mimic them instead of writing complaints on here. There will always be bad players in games i.e. call of duty, halo, LoL, dota, WC3, sc2, sc etc etc etc