i must do my best.try to make difference什么意思?

I must do my best not to try my best和I must do my best not try my best哪个对? My English is very poor.I must _(do) my best.怎么填 I WILL DO MY BEST 请问 I DO MY BEST 请问 I DO MY BEST I already do my best! i must do my best.try to make difference什么意思? （ok,i will do my best! Do my best to do what I want to do! No matter what I do,I will do my best Because of you,I need do my best to my study So I must give up some happies to work!这句话怎么翻译呢? I will do my best to do for our future I try my best to do my work.中文意思 hey~my darling Happy Birthday!Best wishes for you!I hope you have a better future and find tr I will do my best to teach my students well I will do my best 这段不理解 do my best to do my best to I will try my best to do it