Key to Unit 4

Study Guide

1. has been giving
   
2. has always lived
   
3. has been going on
   
4. have been increasing
   
5. have never understood
   
6. haven't read
   
7. have only worked/have only been working
   
8. has stopped
   
9. have been repairing
   
10. have you been doing

2.

1. b)
   
2. a)
   
3. b)
   
4. a)
   
5. a)
   
6. b)
   
7. a)
   
8. b)

Reading comprehension

1. F
   
2. T
   
3. F
   
4. F
   
5. T
   
6. T
   
7. F
   
8. F
   
9. F
   
10. T

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