我无法保证，无法向你承诺什么，但我会做到。

I cannot assure, can't promise you anything, but I'll do it.

youdao

承诺是很难保持，但我向你保证：如果我成为英语课代表，我会尽自己的最大努力帮助大家。

Promises are hard to keep, but I promise you: If I become the English Rep, I will do my best. Thank you.

youdao

承诺是很难保持，但我向你保证：如果我成为英语课代表，我会尽自己的最大努力帮助大家。

Promises are hard to keep, but I promise you: If I become the English Rep, I will do my best. Thank you.

youdao