`1`. T-shirts are sold at the gate of the tourist site by them.

`2`. A network of wind turbines will be installed by them to generate electricity.

`3`. In the countryside, plants will be burned to produce heat.

`4`.  Energy consumption will be reduced by them as soon as possible.

`5`.  A powerful company will be developed by them.

`6`. Solar energy will be used by them to solve the problem of energy shortage.

`7`. The temple was reconstructed by them in 1930.

`8`. Ho Chi Minh Mausoleum is visited by thousands of people every day.

`9`. She is not invited by me to join the party.

`-` Cấu trúc chung : Câu khẳng định

`(+)`  Active voice: S1+ V(thì)+ O2+ adv( place)+ adv ( time)

→Passive voice: S2+ be ( thì)+ Vpp+ adv ( place)+ [by+O1]+ adv ( time)

`-` Cấu trúc chung: Câu phủ định ( câu 9)

`(+)` Active voice: S1+ do/ does/ did+ not+ V+ O2+ adv ( place)+ adv ( time)

→Passive voice: S2+ is/am/are/ was/ were+ not+ Vpp+ adv ( place)+ [by+O1]+ adv ( time)

`-` Cấu trúc câu 1, 8: (thể bị động, thì HTĐ)

S+ is/am/are+ Vpp

`-` Cấu trúc từ câu 2→6: ( thể bị động, thì TLĐ)

S+ will be+ Vpp

`-` Cấu trúc câu 7: (thể bị động, thì QKĐ)

S+ was/ were+ Vpp