Unless

Unless you study harder, you will fail the test.   

Unless they return our money by the end of this week, we will go to their office.

He will be mad for at least a week unless you apologize right away.

Unless you complete this task, you will have to go home late.

They won’t respect you unless you respect them. 

Unless we have enough time tomorrow, we won't come and see you.

I am going to school this afternoon unless it rains.

We will be surprised unless he has an accident soon.

Lan won't be back tomorrow unless there is a plane strike.

He will take the job unless the pay is too low.