YOU SAID:

When you try your best but you don't suceed

INTO JAPANESE

ベストを尽くしても成功しない

BACK INTO ENGLISH

I do not succeed even if I do my best

INTO JAPANESE

頑張っても成功しない

BACK INTO ENGLISH

I will not succeed even if I try my best

INTO JAPANESE

頑張っても成功しない

BACK INTO ENGLISH

I will not succeed even if I try my best