Use present perfect continuous or past perfect continuous 1.why are you so dirty? i (play) football with my friends 2.how long you (learn) arabic? 3.kate was very tired, she (do) her room since afternoon/ 4.we (wait) for train for for half an hour

1. i have been playing

2. have you been learling

3. had been doing 

4. we   have been waiting 

1) have been playing (из контекста ясно, что действие только закончилось и   и оставило своеобразный "след", что и объясняет положение вещей в момент речи

2) have you been learning ( продолжительность действия, период времени)

3) had been doing (предшествование, те два действия, где одно произошло первее, другое действие -позже)

4) have been waiting(действие выполняется уже какой-то период времени т.е for-в течение)

the tiger is the largest cat species, reaching a total body length of up to 3.3 metres and weighing up to 306 kg. their most recognizable feature is a pattern of dark vertical stripes on reddish-orange fur with lighter underparts. they have exceptionally stout teeth, and their canines are the longest among living felids, with a crown height of up to 74.5 mm.they are territorial and generally solitary but social animals, often requiring large contiguous areas of habitat that support their prey requirements. this, coupled with the fact that they are indigenous to some of the more densely populated places on earth, has caused significant conflicts with humans. in zoos, tigers have live for 20 to 26 years, which also seems to be their longevity in the wild.

cats are very good pets. kotov i love very much. especially all the little kitten. cats they are not only very beautiful, they more and intelligent animals. here, for example, my grandmother lives the cat мурзик. grandmother says that he understands everything. once my grandmother lost her glasses and for a long time could not find them. and мурзик found the glasses, they fell behind the sofa, and took out for my grandmother. at home, we also lives the cat and he is also very intelligent. his name is barsik. when i sit down to do the lessons he had always come to me. i am doing homework and he sits on the table and stares at them, so i don't forget. he loves when i had something to read, then he begins to purr. most of all he likes stories from the textbook literature. and here's the math he is not very fond of.and even cats can catch mice and that they benefit for the person. in my other grandmother, who lives in the village, the same is a cat. his name is vaska. he protects the economy from mice and from intruders. once he caught a large rat. she was almost as big as he is. he brought the rat grandmother. probably, wanted her to see what he is strong and dexterous. vaska very much likes to fish and therefore, in the summer he goes with the boys on a fishing trip. they gladly feed it caught пескарями, and vaska catch them in substitution of the large dragonflies, for fish bait.