Yes, he's. / Yes, they're.

[xiaoen]

1. Is he a student?
Yes, he is.
Yes, he's.

2. Are they students?
Yes, they are,
Yes, they're.

Hi,
Are the blue parts also correct?

I think they are wrong.

 

[teechar]

Are the blue parts also correct?

No, they're not.

I think they are wrong.

Yes, they are.

 

[emsr2d2]

We don't use these contractions as the last word in a sentence.

 

[GoesStation]

We also don't use them when we want to emphasize the verb:

A: Paul's not a student.
B: He is a student.

A: They're going to Australia?
B: Yes, they are​ going. They leave next Wednesday.