Find sentences with mistakes

• My mother is an doctor.
• I have an great idea.
• It is a good horse that never stumbles.
• The is an house in New Orleans.
• It is an interesting book.
• There is a eraser in my pencil case.
• Does anybody have a pen?
• You can take an horse to the water but you cannot make it drink.
• Bill doesn't have an dog.
• An apple a day keeps the doctor away.