Exercise 1.

1. Place the following sentences into the negative and interrogative form:
a) The computer is working.
b) My keyboard is broken.
c) Jonathan is tired.
d) Marta and Gloria are operating windows system.


2. Use the correct form of the verb to be.
a) Computers ______ machines that perform tasks or calculations.
b) It ___________ the ''brain'' of your computer.
c)The web ________ Also  a shopper's delight.
d) A website ______ a collection of interconnected webpage.
e) These computers _____built to perform a limited number of tasks.


answers:

1- a) The Computer is not working.
        Is the computer working?

b) My Keyboard is not broken.
Is my keyboard broken?

c) Jonathan is not tired.
Is Jonathan tired?

2- a) are
  b) is
  c) is
d) is
e) are