Complete the sentences with the present perfect continuous form of the verbs in brackets and explain why this tense is

1 — Why are you so late? I have been standing here for hours! — I have been trying to remember the Russian name of street where you live.2 — How long is it since you started learning Russian? — I have been learning it since I came to Russia.3 — You look happy. — Yes, I have been talking with my parents in Boston for half an hour.4 — Why are you so wet? — I have been waiting for a bus for two hours and I left my umbrella at home.5 — Could you help me, please. I have been looking for my passport for a long time and I can\'t find it.Время Present Perfect Continuous употреблено в каждом предложении, так как речь идет о совершенном действии, которое продолжалось определенное количество времени, и автор реплики делает акцент на этой продолжительности.