Преобразуйте предложения, поставив существительные во множественное число. 1)i read this book last year. 2) he works for a big firm of designers. 3) she has been writing the article for one hour. 4) there is an office near our house.

Book-books
firm-firms
article-articles
office-offices

I read these books last years.
The works for A big firms of designers.
The has been writing the articles for some hours.
There are an office near our houses.