Если вороны сядут по одной на каждую берёзу , то нехватит 1 берёзы. Если сядут по 2 вороны на каждую берёзу то 1 будет лишняя сколько ворон? Сколько берёз?

Помоги поставить предложения в вопросительную или отрицательную форму
1. My brother has a new car. 2. We have six lessons every day. 3.I have dog many friends at school. 4 My sister had a lot of toys in her childhood. 5 Our family will have a new flat. 6There are many Facultics at the University. 7 There were theree pupils absent at the English  lesson. 8 There will be a bus-stop near our house .9.There is a beautiful picture on the wall. 10. Thereare fifteen pupils in our English group.11.There are eight boys and seven girls among them.