`13.` are being visited

S + is/ am/ are + being + PP + by O

`14.` has already been started

S + has/ have + been + PP + by O

`15.` listened, had done

Before + S + V_ed/ V2, S + had + V_ed/ V3

`16.` had gone, went

S + had + V_ed/ V3 + before + S + V_ed/ V2

`17.` had left, erupted

S + had + V_ed/ V3 + before + S + V_ed/ V2

`18.` found, had bought

S + V_ed/ V2 + after + S + had + V_ed/ Ve

`19.` were delivered

S + was/ were + PP + by O

`20.` will be predicted

S + will + be + PP + by O

`21.` were rescued

S + was/ were + PP + by O

`22.` are built

S + is/ am/ are + PP + by O

`23.` is held

S + is/ am/ are + PP + by O

`24.` were sleeping 

Hành động đang diễn ra trong quá khứ `→` QKTD