Fill in the gaps with mustn’t or needn’t. a teacher is speaking to his students before a test: «you are going to have a test today. your test papers are on your desks. you 1) mustn’t begin until i tell you. you 2) …… hurry; you have plenty of time. you 3) …… speak during the test. you 4) …… write in pen; if you prefer you can write in pencil. you 7) …… stay when you’ve finished; you can leave if you want to, but you 8) …… be noisy. when you leave you 9) …… wait for your friends outside the classroom. wait outside the building! finally, i wish you all good luck. you can begin now! »

It was late to change the dates of the tour yesterday.

Was it late to change the dates of the tour yesterday?

It was not (wasn't) late to change the dates of the tour yesterday.

УТВЕРДИТЕЛЬНАЯ.     I, he, she, it + was

                                        You, we, they + were

ОТРИЦАТЕЛЬНАЯ.       I, he, she, it + was not (wasn't)

                                        You, we, they + were not (weren't)

ВОПРОСИТЕЛЬНАЯ.    Was + I, he, she, it + ?

                                         Were + you, we, they + ?

1.It includes the physical parts of a computer; It performs command or instruction.

2.Collection of instructions that tell the computer how to work;Transforms inputs into an output or product.

3.Central processing unit;It controls the other parts of computer. Managing the activities of the entire system.

4.Arithmetic logic unit;It receives instructions from the control unit.

5.Control unit;It directs operation of the processor.

6.Random-access memory;It lets information to be stored and extracted on a computer.

7.Read-only memory;It permanently stores data on personal computers.

© teramera

Объяснение: