1 I'll try my best to help you, going without saying.
没说的,他一定尽力帮助你。
2
I try to be on my best behaviour all the time.
我始终尽量做到规规矩矩。
3I'll try my best to make you feel at home.
我会尽力使您有宾至如归的感受。
do one's endeavor
do one's possible
exert oneself
try one's best (to do sth)
do one's endeavor
one's possible
endeavour
exert oneself