develop -> развивать
Образование времен: Субъект подвергается (Пассив, или иначе страдательный залог)
  Past - ПрошлоеPresent - НастоящееFuture - Будущее
Факт - Simple
I/he/she/itwe/you/they
was developedwere developed
---
was not developedwere not developed
wasn't developedweren't developed
Ihe/she/itwe/you/they
am developedis developedare developed
---
am not developedis not developedare not developed
 isn't developedare'nt developed
I/he/she/it/we/you/they
will be developed
---
will not be developed
won't be developed
Процесс - Continuous
I/he/she/itwe/you/they
was being developedwere being developed
---
was not being developedwere not being developed
wasn't being developedweren't being developed
Ihe/she/itwe/you/they
am being developedis being developedare being developed
---
am not being developedis not being developedare not being developed
 isn't being developedare'nt being developed
Завершенность - Perfect
I/he/she/it/we/you/they
had been developed
---
had not been developed
hadn't been developed
I/we/you/theyhe/she/it
have developedhas developed
---
have not developedhas not developed
haven't developedhasn't developed
I/he/she/it/we/you/they
will have been developed
---
will not have been developed
won't have been developed
Вместо отсутствующих форм Perfect Continuous употребляются формы Perfect
develop -> развивать