This is my mother's umbrella.
OR
This is my mothers' umbrella.
This is my mother's umbrella.
Do you have the phone number of Helen?
OR
Do you have Helen's phone number?
Do you have Helen's phone number?
A mouse is ..... animal.
A mouse is an animal.
What's your job? I'm .... teacher.
What's your job? I'm a teacher.
The building's roof.
OR
The roof of that building.
The roof of that building.
What is the name of this restaurant?
OR
What is this restaurant's name?
What is the name of this restaurant?
I'm going to buy ... banana and .... apple.
I'm going to buy a banana and an apple.
I live in ... apartment.
I live in an apartment.
That is my parents' car.
OR
That is my parent's car.
That is my parents' car
When is your sister's birthday?
OR
When is the birthday of your sister?
When is your sister's birthday?
I work at ... university.
I work at a university
Soccer is ... sport.
Soccer is a sport
Beijing is the capital of China.
OR
Beijing is China's capital.
Beijing is the capital of China.
OR
Write your name at the page's top.
Write your name at the top of the page.
Can you wait for .... hour?
Do you want ... ice cream or ... apple?
I would like ... coffee.
Do you want an ice cream or an apple?
I would like a coffee.