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1. Have you bought your train ticket yet?
2. The kitchen is a complete mess! What have the children been doing?
3. Julies been learning to drive for six years!
4. Amandas already had lunch, so shell meet us later.
5. How much coffee has she drunk this morning?
6. Simons written three books.
7. Ive done everything I needed to do today! Hurray!
8. It hasnt rained all summer, so the garden is dead.
9. Ive read your book. Here it is, thank you.
10. Shes forgotten how to get to my house.
11. Ive been working in the garden all day and I need a rest.
12. Shes мейд three cakes. They look delicious!
13. David feels great these days. Hes been getting up early lately.
14. Weve always hated rush hour traffic.
15. Recently, Ive been studying a lot. My exams are in a few weeks.
16. Weve been writing this book for months and months.
17. Ive always loved chocolate.
18. Ive wanted to go back to university for a long time.
19. Whats that delicious smell? Have you been cooking?
20. Ive watched seven films this week! 

Перфект употребляется.
1) Если деянье началось в прошедшем и длится в истинном
2) Если деянье часто происходило в прошедшем и продолжает происходить3) Если речь идет о пережитом опыте вплоть до настоящего момента4) Если деяние произошло в прошедшем, но имеет последствия в истинном