1.The ao dai has been mentioned in poems by poets
2.The ao dai is usually worn by women on special occasions
3.Hcm's Mausoleum was visited in HN by Lan and Maryam
Passive voice
1.Poets have mentioned the ao dai in poems
=>The ao dai has been mentioned in poems by poets
2.Women usually wear the ao dai on special occasions
=>The ao dai is usually worn by women on special occasions
3.Lan and Maryam visited HCM's Mausolium in HN
=>HCM's Mausoleum in HN was visited by Lan and Maryam
Passive voice
1.Poets have mentioned the ao dai in poems
=>The ao dai has been mentioned in poems by poets.
2.Women usually wear the ao dai on special occasions
=>The ao dai is usually worn on special occasions by women.
3.Lan and Maryam visited HCM's Mausolium in HN
=>HCM's Mausolium in Ha Noi was visited by Lan and Maryam.
