It corrected me just now with "You've a bag" which is pretty poor English, IMHO...... yes of course "you have a suitcase" is correct. But, "You've" ?
Am I correct in thinking this could be both a question and a statement? If so, Duo marked 'Do you have a suitcase?' as incorrect.
In a conversation, it could be used as both a question and statement, but in this specific exercise, there was no question marks, so it should be a statement.
Would the 'Usted' work as well as the 'Tu' being that the subject is referring to the 'You'?
Yes 'usted' would also work however you would need to conjugate 'tener' into 3rd person singular 'tiene': 'Usted TIENE una maleta.'
I answered "you have a bag" and it corrected me. Maleta means bag or suitcase. This is pretty poor programing.
This is a user driven program so not all correct answers have been included yet for all sentences. Simply report it if you really think something should be included.
Well, the sentence doesn't have a question mark so yes, that is incorrect. That said, if you added the question mark your answer would be right.