1, London is a expensive city.
⇒ London is an expensive city.
2, He is a most intelligent student in our class.
⇒ He is the most intelligent student in our class. =
3, The party was such boring that I decided to leave early.
⇒The party was so boring that I decided to leave early.
4, My father's office are on the second floor.
⇒ My father's office is on the second floor.
5, Peter earned many money last year.
⇒Peter earned much money last year.
6, Your new car is more cheaper than John's.
⇒Your new car is cheaper than John's.
7, Why does Suzie and Guy fell tired?
⇒ Why do Suzie and Guy fell tired?
8, He left college when he is 17.
⇒He left college when he was 17.
9, How long does it take you getting to school?
⇒How long does it take you to get to school?
10, Craig starts work at eight o'clock yesterday.
⇒Craig starts working at eight o'clock yesterday.