`1.` The bomb wasn't found (by them), and many people was killed by its.

`-` Thì quá khứ đơn:

Chủ động:

$(+)$ S + Ved/ V2 + O.

$(-)$ S + did not/ didn't + Vinf + O.

`->` Bị động:

$(+)$ S + was/ were + V(pp) + (by O).

$(-)$ S + was/ were + not + V(pp) + (by O).

`-` find - found - found: tìm thấy

`2.` New trees are being planted along the streets (by them).

`-` Thì hiện tại tiếp diễn:

A`:` S + am/ is/ are + V-ing + O.

`->` P`:` S + am/ is/ are + being + V(pp) + (by O).

`3.` At 4pm yesterday water was still being pumped out (by them).

`-` Thì quá khứ tiếp diễn:

A`:` S + was/ were + V-ing + O.

`->` P`:` S + was/ were + being + V(pp) + by O.