Read and fill in the gaps. Use the Present Perfect Tense or the Present Perfect Continuous Tense. Use the full forms of the verbs.

Nina \(learn\) ... English for 2 years.
The birds \(already/fly\) ... to the South.
They \(know\) ... him for many years.
Mike \(forget\) ... to learn the poem.
The children \(watch\) ... cartoons for 2 hours.
We \(have/not\) ... a holiday for 5 years.
David \(paint\) ... in his studio since 10 o’clock.