You'd

You'd be surprised what you can learn in a week.

Now that you are tired, you'd better rest.

I think you'd better go on a diet.

I think you'd better take a rest; you look ill.

You'd better knuckle down to work.

You'd better not go out today.

You'd better start now.

You'd better not go.

You'd better hurry up.

You'd better consult the doctor.