small- smaller - the smallest
young- younger- the youngest
thin- thinner- the thinnest
thick- thicker - the thickest
tall- taller- the tallest
fine- finer- the finest
new- newer- the newest
straight- straighter - the straightest
few- fewer- the fewest
easy- easier- the easiest
busy- busier- the busiest
dirty- dirtier- the dirtiest
famous- more famous- the most famous
beautiful- more beautiful - the most beautiful
difficult- more difficult - the most difficult
serious- more serious - the most serious
comfortable- more comfortable - the most comfortable
expensive- more expensive - the most expensive
suitable- more suitable - the most suitable
charming- more charming- the most charming
good- better- the best
much- more- the most
bad- worse- the worst
little- less- the least
many- more- the most.
1. How long have you studied English? 2. I haven't visited the USA yet. 3. He has just given an interview. 4. They have lived in Canada since 2015. 5. I haven't still met your brother. 6. They have lived there for twenty years