1. Choose the right tense form. 1. The birds have already flown/have been flying to the South. 2. Ben has forgotten/has been forgetting to learn the poem. 3. The train has just come/has been coming. 4. John has been painting/has painted in his studio since 10 o'clock. 5. Their parents have been/have being friends since their childhood. 6. Tom has been/ has been being a student for 2 years.

Решение:

• 1. The birds have already flown to the South. (Действие завершено, результат виден).
• 2. Ben has forgotten to learn the poem. (Действие завершено, забыл и теперь не помнит).
• 3. The train has just come. (Действие только что завершилось, результат – поезд здесь).
• 4. John has been painting in his studio since 10 o'clock. (Действие началось в прошлом и продолжается, акцент на длительности).
• 5. Their parents have been friends since their childhood. (Состояние, которое длится с детства, акцент на результате).
• 6. Tom has been being a student for 2 years. (Действие началось в прошлом и продолжается, акцент на длительности).

Ответ:

• 1. flown
• 2. forgotten
• 3. come
• 4. painting
• 5. friends
• 6. has been being