Sure, let's analyze each sentence one by one and underline the correct word. I'll also provide explanations for the choices made.
This is my sister. Her/His name is Emma.
- Correct choice: Her
- Explanation: "Sister" is a female noun, so we use "her" to refer to something belonging to a female.
Where is Jack? It's your/his birthday today.
- Correct choice: his
- Explanation: "Jack" is a male name, so we use "his" to refer to something belonging to a male.
This isn't Mike and Bob's dog. Their/Our dog is white.
- Correct choice: Their
- Explanation: "Mike and Bob" are plural subjects, so we use "their" to indicate possession by more than one person.
Is his my/your bike, Rita?
- Correct choice: your
- Explanation: When asking someone directly, we use "your" to refer to something that belongs to the person we are speaking to. "Rita" is being addressed, so we use "your."
We are sisters. This is our/your bedroom.
- Correct choice: our
- Explanation: "We" indicates a group including the speaker, so "our" is used to show possession by that group.
They are brothers. Their/Its names are Matt and Jack.
- Correct choice: Their
- Explanation: "They" refers to multiple people, so "their" is used to show possession by those people. "Its" is used for singular neuter nouns, which does not fit here.
Putting it all together, the sentences with the correct words underlined would be:
- This is my sister. Her name is Emma.
- Where is Jack? It's his birthday today.
- This isn't Mike and Bob's dog. Their dog is white.
- Is his your bike, Rita?
- We are sisters. This is our bedroom.
- They are brothers. Their names are Matt and Jack.