Staff wishing to smoke may use the garden.
To save some money, I think he ought to eat at home more often.
You can borrow some money if you really want to.
We have to put the lights out by midnight every night.
If you want to look smart, you should cut your hair.
The house is so dirty - I really must clean it.
To give advice
To give permission
To express obligation
To give permission
To express obligation
To give advice