Grammar. 2. Choose the correct spelling of the following words and give them definitions. processor proccesor maicrocheep microchip treated

Vocabulary

2. Choose the correct spelling of the following words and give them definitions.

processor proccesor	maicrocheep microchip	treated trieted	dimantion dimension	surface serfice	spatering sputtering
epitaxy apetaxy	havoc hevok	spack speck	scale sceil	maticulos meticulous	airlock aerolock

3. Study the sentences below and pay attention to the underlined verb forms in italics.

The ENIAC contained 18,000 buzzing electronic switches.

The ENIAC was thousands of times less powerful than a modern laptop.

Transistors used much less power, and were far more reliable.

Even after the invention of transistors, computers were still a tangled mass of wires.

Integrated circuits changed all that.

The invention of an integrated circuit made possible all modern microelectronic gadgets.

Answer the following questions:

10) What are these verb forms?

11) was, were. What verb has such forms?

12) contained, used, changed. What do these verb forms have in common?

13) used, made. What is different between these verb forms?

14) What tense are these verb forms in?

It is the Past Indefinite or Past Simple Tense.

4. How do we form sentences in the Past Indefinite? Complete the table.

Positive	Negative	Interrogative
Subject + Irregular Verb (II form). Subject + Regular Verb + ed	Subject + did + not + Verb.	Did+ Subject+Verb?
I taught English yesterday. You He studied yesterday. She It We They	I did not teach yesterday.   He did not study yesterday.	Did I teach yesterday?   Did he study yesterday?

5. So, now we can form the Past Indefinite. But when do we use the Past Indefinite? Study the following table and give your own examples.

Actions happened…	Examples
A completed action in the past. yesterday the other day the day before yesterday last week / month / year some weeks / months / years ago	· Three brilliant US physicists invented transistors at Bell Laboratories in New Jersey in 1947. · The invention of an integrated circuit made possible all modern microelectronic gadgets. · It was an amazingly clever idea. · We had Chemistry last week.
A series of completed actions in the past.	· I finished work, walked to the beach, and found a nice place to swim. · He arrived from the airport at 8:00, checked into the hotel at 9:00, and met the others at 10:00. · Did you add flour, pour in the milk, and then add the eggs?
Duration in past for some weeks / months / years all day for some minutes / hours	· I lived in Brazil for two years. · Shauna studied Japanese for five years. · They sat at the beach all day. · They did not stay at the party the entire time. · We talked on the phone for thirty minutes. · How long did you wait for them? We waited for one hour.

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