I used tu dors où rather than vous dormez où. It was corrected to tu dormes où. I believe dors and not dormes is correct.

Question

Accepted Answer

Hi D,
The first sentence says -
Monique : We are going to spend 4 days ... = On va passer 4 jours...
Patrick asks :
Where are you going to sleep?
the 3 correct possibilities given are in the vous ( plural) form -

Et vous dormez où ?
Et où est-ce que vous dormez?
Et où dormez-vous?

Answer

Hi D,On the face of it I agree with you  --   but tu dormes would be subjunctive mood.You should flag this up as a possible error.Jim

Answer

I agree with your initial answer. In this setting of 2 friends talking to each other, at the very least 'tu' for the enquiry directed to Monique personally, is equally as correct an interpretation as 'vous', which would refer to where is everyone staying.

I didn't notice any correction being to 'tu dormes où' - sometimes the correction marks end up looking very odd when there are 'compound errors' being red-lined though.