1. was discovered ( bị động QKD: was/ were + pp)
2 was invented( bị động QKD: was/ were + pp)
3 are sung (bị động HTD: is/ am/ are + pp)
4 are set off(bị động HTD: is/ am/ are + pp)
5 were rescued( bị động QKD: was/ were + pp)
6 are cleaned (bị động HTD: is/ am/ are + pp)
7 will be built (bị động tương lai đơn: will + be + pp)
8 is spoken (bị động HTD: is/ am/ are + pp)
9 was written ( bị động QKD: was/ were + pp)
10 is played(bị động HTD: is/ am/ are + pp)