Complete the sentences with the present perfect continuous form of the verbs in brackets and explain why this tense is used in each setence. 1 - why are you so late? i (stand) here for hours! - i (try) to remember the russian name of street where you live. 2 - how long is it since you started learning russian? - i (learn) it since you i came to russia. 3 - you look happy. - yes, i (talk) with my parents in boston for half an hour. 4 - why are you so wet? - i (wait) for a bus for two hours and i left my umbrella at home. 5 - could you help me, please. i (look) for my passport for a long time and i can't find it.