Сhoose the correct verb form.
1) They have been writing/ have written a letter for an hour.
2) My sister has had/has been having a car for a year.
3) We have been playing / have played volleyball since morning.
4) She has understood / has been understanding English since 13 years.
5) I have been learning/ have learnt German for 5 years

1) They have been writing a letter for an hour.2) My sister has had a car for a year.3) We have been playing volleyball since morning.4) She has understood English since 13 years.5) I have been learning German for 5 years