1. People say that the soil here is very rich.
⇒The soil here is said to be very rich.
2.They export rice to Africa.
⇒Rice is exported to Africa.
3.Poets have mentioned the"ao dai" in poems for centuries.
⇒The"ao dai"has been mentioned in poems by poets for centuries.
4.You must clean this machine every time you use it.
⇒This machine must be cleaned every time you use it.
5.The students attendedthe lecture.
⇒The lecture was attended by the students.
6.I haven't seen him for three years.
⇒He hasn't been seen for three years .
7.We shouldn't cut the trees.
⇒The trees shouldn't be cut.
8.Nobody has seen him since 2000.
⇒He hasn't been seen since 2000.
Xin ctlhn!Chúc bạn hok tốt🥰