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.
It can be ommitted but is not mandatorily ommitted. It is optional. Both sentences are equally valid.
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?
nahi, or the negative, usually comes directly before the verb it negates. I don't know about other adverbs.
Can someone explain why we should use वह in the sentence? Raj is the subject but what is वह?
It is that book
Raj does not read that book
Isn't बही also an acceptable way of saying book?
No. That is an obsolete word and even when it was used it didn't refer to books but rather to notebooks that were used for account keeping.