Present Perfect Continuous и разделительные вопросы. 1. Mike has been learning/has learned French for 3 years. 2. Many birds have already flown/have been flying to the North. 3. My sister has known /has been knowing him for many years. Помогите
Ответ:
1. Mike has been learning French for 3 years.
2. Many birds have already flown to the North.
3. My sister has known him for many years.