1.This is his brother改复数形式 2.That is my sister.改复数形式 3.Those

1. These are his brothers

2. Those are my sisters

3. That is a blue pen

4. Who is she?

5. These are my parents.

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1. These are his brothers

2. Those are my sisters.

3. That is a blue pen.

4.She's my sister对my sister提问

Who is...