Choose the right tense form. nina has been learning/has learned english for 2 years. the birds have already flown/have been flying to the south. they have known /have been knowing him for many years. mike has forgotten/has been forgetting to learn the poem. the children have been watching/have watched cartoons for 2 hours. the train has just come/has been coming. we haven’t been having/ haven’t had a holiday for 5 years. she has been teaching/has taught at this school for twenty years. david has been painting/has painted in his studio since 10 o’clock. mary and sam have collected/ have been collecting stamps for 3 years. their parents have been/have being friends since their childhood. dave has been/ has been being a student for 2 years.
The birds have already flown to the South.
They have known him for many years.
Mike has forgotten to learn the poem.
The children have been watching cartoons for 2 hours.
The train has just come.
We haven’t had a holiday for 5 years.
She has been teaching at this school for twenty years.
David has been painting in his studio since 10 o’clock.
Mary and Sam have been collecting stamps for 3 years.
Their parents have been friends since their childhood.
Dave has been a student for 2 years.