Choose the correct form: 1. Nina has been learning/has learned English for 2 years. 2. The birds have already flown/have been flying to the South. 3. They have known/have been knowing him for many years. 4. Mike has forgotten/has been forgetting to learn the poem. 5. The children have been watching/have watched cartoons for 2 hours. 6. The train has just come/has been coming. 7. We haven’t been having/haven’t had a holiday for 5 years. 8. She has been teaching/has taught at this school for twenty years. 9. David has been painting/has painted in his studio since 10 o’clock. 10. Mary and Sam have collected/have been collecting stamps for 3 years. 11. Their parents have been/have being friends since their childhood. 12. Dave has been/has been being a student for 2 years.

Перевод задания: Выберите правильную форму.

1. Nina has been learning English for 2 years. (Нина учит английский уже два года.)
2. The birds have already flown to the South. (Птицы уже улетели на юг.)
3. They have known him for many years. (Они знают его уже много лет.)
4. Mike has forgotten to learn the poem. (Майк забыл выучить стихотворение.)
5. The children have been watching cartoons for 2 hours. (Дети смотрят мультфильмы уже два часа.)
6. The train has just come. (Поезд только что прибыл.)
7. We haven’t had a holiday for 5 years. (Мы не отдыхали уже пять лет.)
8. She has been teaching at this school for twenty years. (Она преподаёт в этой школе уже двадцать лет.)
9. David has been painting in his studio since 10 o’clock. (Дэвид рисует в своей студии с десяти часов.)
10. Mary and Sam have been collecting stamps for 3 years. (Мэри и Сэм собирают марки уже три года.)
11. Their parents have been friends since their childhood. (Их родители дружат с детства.)
12. Dave has been a student for 2 years. (Дэйв учится уже два года.)

Действие, продолжающееся в течение указанного периода, обычно выражается Present Perfect Continuous; с глаголами состояния, например know и be, используется Present Perfect. Для завершённых событий подходят формы Present Perfect.