`1`. The supermarket across the street is less expensive than this supermarket.
(less : ít hơn)
`2`. The English teacher has taught at our school for three years.
S+Started/began+to_V/V_ing+...+khoảng TG+ago
=S+have/has V3/ed, for + khoảng TG
`3`. My doctor said that I shouldn't eat in front of the television.
should not=shouldn't : không nên
`4`. If you don't study harder, you won't pass the exam.
(Unless = If not)
`5`. Hanoi surburban areas are not as noisy as Hanoi urban districts.
(so sánh ngang bằng as adj as)