In Unit 4, you are going to learn how to use some of the most important modal verbs: CAN - CAN'T - MUST - MUSTN'T - SHOULD - SHOULDN'T - HAVE TO - DON'T HAVE TO.
By using these verbs you can express: ability, possibility, permission, obligation, prohibition, advice, and absence of obligation.
The vocabulary of the unit is related to new technologies, different gadgets and other appliances used in the modern world. .
When you finish, you will be able to complete the tasks of the unit