`6`. There are many historic houses in Hoi An ancient town.

`->` There are (many) + N-số nhiều

`7`. The air is polluted with smoke from factories.

`->` Bị động HTĐ: S + am/is/are + V-pII + (by O)

`8`. Living in a big city is much more expensive than living in the countryside.

`->` Nhấn mạnh so sánh hơn: S1 + be + much + adj-er/more + adj + than + S2

` 6. ` There are many historic houses in Hoi An ancient town

` - ` There + be + N

` - ` There are + ( many ) + N số nhiều đ

` 7. ` The air is polluted with smoke from factories

` - ` Bị động HTD: S + tobe + V ( 3 / ed ) + ( by O )

` 8. `  Living in a big city is much more expensive than living in the countryside

` - ` V - ing đứng đầu làm chủ ngữ

` - ` Nhấn mạnh so sánh hơn: S1 + tobe + much + adj + -er / more adj + than + S2 / N

` # ` ` Ka `