-My room is light. -How much did you pay for this book? -My brother is a student. -This car is mine. -Let's take a long walk in the park. -Who has opened this box of sweets? -I think, she did it yesterday. -Mary is my good friend. -This big cup of coffee is without sugar.- Would you like some sugar in it? -Will you, please, give me that red apple? -I never eat red apples.