1 i do not have a bookshelf in my bedroom ->

There isn't a bookshelf in my bedroom

there + is/isn't + n + o

2 this house is small ->It is a small house

it is + adj + n

3 the bookstore is to the left of the toystore -> the toystore is to the right of the bookstore

to the left >< to the right

4 Hoa often walks to school every morning ->Hoa often goes to school on foot every morning

walks to school = go to school on foot

5 Ho Chi Minh city is more modern than Hoi An -> Hoi An is not as modern as ho chi minh city

hồ chí minh hiện đại hơn  hội an => hội an không hiện đại bằng hồ chí minh