16. There are a lot of vehicles on the streets in the city. There are few vehicles on the streets in the countryside. (Crowded)
-> The streets in the city are Crowded than  in the countryside.
17. The buses run every 30 minutes .The trains run very hour. (Frequent)
-> The buses run Frequently than The trains
18. Yesterday the temperature was six degrees. Today it’s only three degrees. (Cold)
-> It is Colder Today than Yesterday
19. I’m quite tall but you are taller. (As……..as)
-> I’m not as tall as you .