Изберите из глаголов в скобках подходящую форму- present perfect либо present

Изберите из глаголов в скобках подходящую форму- present perfect или present perfect continuous. переведите на российский язык: 1) i (have written,have been written) the letter for 30 minutes. 2. you( have spoken, have been speaking) over the telephone for half an hour already. 3. he (has returned, has been returning) from Moscow already. 4.these young athletes( have studied, have been studying) the technique of the game for two months. 5. i just( have come, have been coming) home yet. 6.they( have trained,have been training) here since 5 o39;clock. 7. she ( has answered, has been answering) the questions already.