The key answer of exercise 5

a)

1. 've been doing (used in the text, although 've done is also possible)
2. has cleaned
3. has always loved
4. has turned
5. 've already raised
6. 've been dancing

b)

• Sentences 1, 2 and 3 → The perfect is used here to describe activities or states which started in the past and continue up to now.
• Sentences 4 and 5 → The perfect is used to describe an event / action in the past which is completed although we don't know when. The link is that we are interested now in the result this has had.
• Sentence 6 → The perfect is used because the activity has only just finished and we can see the result now.

c)

• Rule 1 → continuous, e.g. Sentences 1 and 6
• Rule 2 → simple, e.g. Sentences 2, 4 and 5
• Rule 3 → simple, e.g. Sentences 2 and 5
• Rule 4 → simple, continuous, e.g. Sentence 1
• Rule 5 → simple, e.g. Sentence 3