2º -  Inglés 

New Technologies

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

Petroglyph from the Bronze Age
The history of communication dates back to the earliest signs of life. Communication can range from very subtle processes of exchange, to full conversations and mass communication. Human communication was revolutionized with speech perhaps 200,000 years ago. Symbols were developed about 30,000 years ago, and writing about 7,000. On a much shorter scale, there have been major developments in the field of telecommunication in the past few centuries.