Why is it है and not हूँ?
है means 'it is' (it or something)
हूंँ means 'I am'
why not: मेरे पास भी एक किताब है
Then you're saying - I too have 'one' book. Which is not wrong, but not duolingo's concern
Isn't 'Mujhe bhi ek kithab hai' right?
If this sentence beginning "i too....." is correct then the previous sentence "i also cook" should be correct.
Don't we say rather " i have a book too" ?
How would you say "I have a book too" (focusing on multiple things that one person has) in contrast to " I too have a book" (focusing on multiple people who have one particular thing)?