Is there any difference between those sentences ?
Is there any difference in meaning when contracting pronouns and verbs to be in negative sentences in those 2 ways ?

She's not smart.
She isn't smart.

or

They're not doctors.
They aren't doctors.

Question

Is there any difference between those sentences ?
Is there any difference in meaning when contracting pronouns and verbs to be in negative sentences in those 2 ways ?

She's not smart. 
She isn't smart.

or

They're not doctors. 
They aren't doctors.

Answer

they both mean the exact same things. it's just different words being contracted. if you take them apart, they are the same sentences. "They are not doctors" and "she is not smart". both work perfectly. :)

Answer

There's no difference in meaning. However, I find the first options easier to say.

Answer

no