explain -> объяснять
Образование времен: Субъект подвергается (Пассив, или иначе страдательный залог)
  Past - ПрошлоеPresent - НастоящееFuture - Будущее
Факт - Simple
I/he/she/itwe/you/they
was explainedwere explained
---
was not explainedwere not explained
wasn't explainedweren't explained
Ihe/she/itwe/you/they
am explainedis explainedare explained
---
am not explainedis not explainedare not explained
 isn't explainedare'nt explained
I/he/she/it/we/you/they
will be explained
---
will not be explained
won't be explained
Процесс - Continuous
I/he/she/itwe/you/they
was being explainedwere being explained
---
was not being explainedwere not being explained
wasn't being explainedweren't being explained
Ihe/she/itwe/you/they
am being explainedis being explainedare being explained
---
am not being explainedis not being explainedare not being explained
 isn't being explainedare'nt being explained
Завершенность - Perfect
I/he/she/it/we/you/they
had been explained
---
had not been explained
hadn't been explained
I/we/you/theyhe/she/it
have explainedhas explained
---
have not explainedhas not explained
haven't explainedhasn't explained
I/he/she/it/we/you/they
will have been explained
---
will not have been explained
won't have been explained
Вместо отсутствующих форм Perfect Continuous употребляются формы Perfect
explain -> объяснять