You will catch up with others if you study harder.

假如你再努力一些的话，将会追上其它人。

youdao

You will never pass the exam unless you study harder.

除非你加紧学习，否则考试永远过不了关。

youdao

You won't get high marks in your exam unless you study harder.

除非你努力学习，否则在考试中你得不了高分。

youdao

And the same study shows that the longer you're out of work, the harder it is to get a new job.

CNN: Back to work! Re-entering the job market in the New Year