The students are going to the library after school.
_____
Amy is going to do sports at 3 this afternoon.
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The students are going to the library after school.
_____
Amy is going to do sports at 3 this afternoon.
___
The students are going to the library after school.
The students aren't going to the library after school.
Are the students going to the library after school? Yes, they are. / No, they aren't.
Who are going to the library after school?
Amy isn't going to do sports at 3 this afternoon.
Is Amy going to do sports at 3 this afternoon? Yes, she is./ No, she isn't.
Who is going to do sports at 3 this afternoon?