Выполнить задания 50.1 - 50.2 как показано в примерах

Iusually clean my house on saturday. it’s saturday and i am cleaning  the furniture . they usually turn on the light in the evening. it’s rather dark outside but they aren`t turning  on the light. he don`t understand what the problem is. do you see a boy who is sitting  at the table? look! the birds are flying  in the sky. they usually fly before the rain. ann seldom gets up  early in summer. but these days she is getting up at 7 a.m. he can’t answer the telephone now. he is taking  a shower. leave me alone. i am trying  to concentrate. i always concentrate before tests. my father does a lot of work every day. he is working  in the garden at the moment. tom doesn`t recognize the man who is waving  him. he wonders who he is. i don`t want  this sandwich. i am not  hungry. i think sam is hungry. i see you are drinking  coffee. do you drink coffee every morning? – no, i usually drink tea.