Why is है again included in a negative sentence? Someone had previously explained that forms of the verb होना would be omitted in a negative sentence unless they were the main verb. So far this was the case for all Duo sentences as well.
Does anyone know why the word order changes? I wrote राज वह किताब पढ़ता नहीं, which is S-O-V-Ad. It marked it as correct but also suggested राज वह किताब नहीं पढ़ता है, which is S-O-Ad-V?