C) поставьте предложения в отрицательную и вопросительную форму:

Пример: (+) She has been writing the letter for half an hour.

(-) She has not been writing the letter for an hour.

(?) Has she been writing the letter for half an hour?

1. Dirk has been studying psychology since 2000.

2. We’ve been dancing the whole night.

3. I’ve been going sightseeing in Moscow since Monday.

4. They’ve been staying in for the whole week.

5. The authorities have been developing the construction plan for 3 months.

6. This plant has been producing machinery for years.

7. My friend’s been visiting the museums in Cuzco [‘ku:sk∂u] this week.

8. We’ve been reading English books in the original for some time already.

9. She’s been taking extra classes in chemistry this term.

10. Ted’s been studying by correspondence for 2 years.

Упражнение 23. Поставьте вопросы с how long? и ответьте на них, используя предложенные слова и предлоги for и since:

Пример: (Jane / take a shower?) (fifteen minutes)

How long has Jane been taking a shower? – She has been taking a shower for fifteen minutes.

1. (Nick / learn / English?) (one term)

2. (you / revise / the words for the quiz?) (the whole day)

3. (she / study / to pass entrance exams?) (half a year)

4. (Ms. Addams / live / in this residential area?) (she moved to Moscow)

5. (the Browns / stay / with their grandparents?) (Monday)

6. (your mother / watch / this Brazilian serial?) (it started on TV)

7. (you / learn / the words for the topic “School”?) (2 weeks)

8. (the students / write / a test in Algebra?) (20 minutes)

9. (it / rain?) (midnight)

10. (Jackson / study / law?) (two and a half years)

THE PRESENT PERFECT VS THE PRESENT PERFECT CONTINUOUS

Упражнение 24.

a) для каждого из данных предложений напишите одно предложение в форме Present Perfect, а другое – в форме Present Perfect Continuous с использованием предложенных слов:

Пример: My father is reading a newspaper.

the first two pages / for half an hour

My father has read the first two pages. He has been reading for half an hour.

1. I’m writing a course paper.

30 pages / for a week

2. Jim is learning a poem by heart.

since two in the afternoon / a half of it

3. Sandy is taking his exams now.

2 out of 4 exams / since the end of the term

4. Jane is cooking dinner now.

since morning / the vegetable soup

5. This postgraduate student is giving us lectures in computer science.

3 lectures / since the beginning of our second year

6. I am learning English.

since I entered university / 500 English words

7. I’m getting very good marks for my reports in Literature.

for two months / three excellent marks

8. Anna is cleaning her flat.

for several hours / the bedroom and the living room

9. Will is writing his graduation paper.

since October / 50 pages

10. My sister is doing her homework.

two exercises / for quite a long time