$6.$ Liz was invited to rice-cooking festival by Ba.

$7.$ People don't plant rice in that country.

$8.$ The meeting will be held before May Day.

$9.$ The engine of car has to be repaired.

$10.$ This machine mustn't be used after 5:00 p.m.

______________________________________________________

`-` Thì QKĐ(BĐ) : S + was/were + `V3` (+ by sb/O)

`-` Thì QKĐ(Negative) : S + didn't + Vinf...

`-` THì TLĐ(BĐ) : S + will/shall + be + `V3` (+ by sb/O)

`-` Modal Verbs(BĐ) : S + must/should/may + be + `V3` (+by sb/O)

`-` Have to(BĐ) : S + have/has to be + `V3` (+by sb/O)

` 6 . ` Liz was invited to the Rice - cooking festival by Ba 

- Bị động thì QKĐ : S + was / were + ( not ) + V3 + ( by O ) 

` 7 . ` People don't plant rice in that country 

- Câu chủ động thì hiện tại đơn ( dạng phủ định ) : S +don't / doesn't + V nguyên mẫu

- Plant ( v ) : trồng 

` 8 . ` The meeting will be held before May Day 

- Bị động thì TLĐ : S + will + ( not ) + be + V3 + ( by O ) 

` 9 . ` The engine of the car has to be repaired 

- Bị động have to : S + have to be + V3 + ( by O ) 

` 10 . ` This machine must not be used after ` 5:00` pm 

- Bị động với động từ khiếm khuyết must : S + must + ( not ) + be + V3 + ( by O )