I'll never lose heart even if I should fail ten times.

即使失败10次，我也不灰心。

《新英汉大辞典》

If I should fail I would try again.

万一失败，我还要试一试。

youdao

If I should fail, I will try again.

万一我失败，我会再试。

youdao

I will have a try even though I should fail.

哪怕失败，我也要试一下。

youdao

If I should fail, am I entitled to a makeup exam?

假如我万一考砸了，我是否还有资格补考一次？

youdao

I won't give up even though I should fail a thousand times.

即使失败一千次，我也决不放弃。

youdao

I won't give up even though I should fail a thousand times.

即使失败一千次，我也决不放弃。

youdao