Выполнить упражнение. Поставить глаголы в нужное время. После каждого предложения дать пояснения, в скобках, почему использовано это грамматическое время.

we have become more dependent on chemicals.  and, strangely, we hardly notice anymore. every single day we start and finish by using a product that has at least 10 different chemicals in it: a toothpaste. later, we take a shower using several products (shampoo, conditioner, body wash, lotion). the names of the chemicals in all these products will take a few pages to list. later on, we eat chemically enhanced food, packaged in plastic.  we wear and sleep on synthetics, we drink and eat foods that are drastically modified with chemicals.  all these innovations have been introduced less than 50 years ago, just two generations have been around so many chemicals lately.  and, scarily enough, we hardly notice anymore.

hello, can you help?                                               вы: , не могли бы вы мне ?

yes, sure. what can i do for you?         продавец: конечно. чем я могу быть вам полезен?

could you show me those flowers?                 вы: не могли бы вы показать те цветы?

here they are.                                                                    продавец: вот, .

how much are they?                                                           вы: сколько они стоят?

20 pounds.                                                                                продавец: 20 фунтов

thank you very much.                                                    вы: большое.

you are welcome.                                                          продавец: приходите ущё.

i will try to lead small excursion on our apartment for you. so, having entered into apartment, we appear in a spacious hall. at the left there is a case and a hanger for clothes, and on the right - a curbstone and a mirror. there and then near to one party an input in kitchen, with another - doors in a bedroom of parents and a children's room. in a children's room it is light and spacious, there is an exit on a loggia. we manage here with the brother together. in our bedroom there are two beds. the left corner occupies clothes, nearby - a case for toys and books. by the way, at us fine children's library, in it very interesting books are collected. too it is a lot of toys - my brother still small.on the right party along a wall stand a curbstone for the tape recorder and the tv, a desk behind which i do homework, i draw. to tell the truth, on my desk the disorder quite often reigns, and mum is sometimes angry at me for it. over a table - book shelves where there are my textbooks, and also volumes from a series «children's encyclopaedia» which i sometimes like to esteem. on one of shelves i have allocated a place for a corner where has collected various bagatelles for memory of a trip on the sea: beautiful stones, sea cockleshells, souvenirs. i all it has arranged so that every morning, having opened eyes, i could admire beauty which reminds me that soon again there will come summer, and we all family will go again to the tender and warm sea. now you represent, as our apartment looks. come to us on a visit - and you will see, how at us is pure and cosy.