`6`. Was this dictionary bought ( by you ) two weeks ago `?`
`-` Cấu trúc : Was/were + S + V(2/ed) by O ?
`7`. Our teeth should be cleaned twice a day.
`-` Cấu trúc : S + động từ khuyết thiếu + be PII ( by O )
`-` Động từ khuyết thiếu : should
`8`. I am not impressed by Alan's knownledge about Science and Technology.
`-` Cấu trúc : S + to be ( not ) + VPII by O
`9`. All of us are driven to school by her father every day.
`-` Cấu trúc thì HTĐ : S + to be PII + by O
`10`. A new school is going to be built here next year
`-` Cấu trúc : S + to be going to be PII + by O

Was this dictionary bought ( by you ) two weeks ago ?

→Was/were + S + V(2/ed) by O ?

Our teeth should be cleaned twice a day.

⇒ Động từ khuyết thiếu : should ( Cấu trúc) ⇒ S+ động từ khuyết thiếu + be PII ( by O )

⇒ I am not impressed by Alan's knownledge about Science and Technology.

→ S + to be ( not ) + VPII by O

c9kbt.

A new school is going to be built here next year
⇔ Cấu trúc : S + to be going to be PII + by O