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Exercise 1

1) is

2) is'nt

3) is

4) are

5) are

6) are'nt

7) am'nt

Exercise 2

[1] 're doing

[2] is writing

[3] 's not

[4] 's thinking

[5] is

[6] thinking

[7] is watching

[8] 're talking

[9] 're not

[10] am I doing

[11] 'm wasting

Exercise 3

[1a] are you waiting

[1b] 'm waiting

[2a] Are you using

[2b] 'm not

[3a] is Paul wearing

[3b] he is

Exercise 4

[1a] I am waiting

[1b] Is he working today

[1c] he is

[2a] What are you cooking

[2b] Joe is getting pizza

[2c] Where is he buying

[2d] They are selling pizzas

Exercise 5

1) What are you reading

2) I'm going to school
3) Steve is playing tennis with Alex

4) Why are you sitting down
5) They are building a new house

6) What are you reading
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[1] work

[2] teach

[A] building

[B] working

[3] eat

[4] working

[5] help

[6] work

[7] make

[8] make

[C] teaching

Exercise 3

f

e

a

b

d

c

Exercise 4

[1] on

[2] in

[3] with

[4] children

[5] money

[6] vegetables

[7] a house

Exercise 5

1) [A] learn [B] teach

2) [A] teaches [B] learns

3) [A] learn [B] teach

4) [A] learning [B] teaching.