`1`. He has played football for 10 years
`2`. My bike is cheaper than Miss Trang's
or My bike is not as expensive as Miss Trang's
- tobe as + adj/adv + as: kiểu so sánh bằng
- tobe not as + adj/adv + as: không bằng
`3.` Nobody in my family is more beautiful than my mother
`4`. Robots are able to take care of sick people
- tobe able to do s.th = can do s.th: có thể làm gì
