1. His books are very popular in many countries. - Его книги очень популярны во многих странах. (окончание -s в обоих случаях является признаком множественного числа имен существительных book и country)
2. He often buys (показатель 3-го лица единственного числа глагола buy в Present Indefinite) me flowers (признак множественного числа имени существительного). - Он часто покупает мне цветы.
3. My father's house is very cosy. - Дом моего отца очень уютный. ('s - показатель притяжательного падежа имени существительного father)
If i had a player typewriter I would listen to music
If i knew a address, i would a letter to her
If he worked slowly, he wouldn't make so many mistakes
I could tell you the truth if i knew
He might get fat if he didn't stop eating much
I would have a car if i could afford it
What would you do if you got stuck between two floors?
If he knew that it was dangerous he wouldn't come
If i won a big money, i would give up my job