begin -> начинать
Образование времен: Субъект подвергается (Пассив, или иначе страдательный залог)
  Past - ПрошлоеPresent - НастоящееFuture - Будущее
Факт - Simple
I/he/she/itwe/you/they
was begunwere begun
---
was not begunwere not begun
wasn't begunweren't begun
Ihe/she/itwe/you/they
am begunis begunare begun
---
am not begunis not begunare not begun
 isn't begunare'nt begun
I/he/she/it/we/you/they
will be begun
---
will not be begun
won't be begun
Процесс - Continuous
I/he/she/itwe/you/they
was being begunwere being begun
---
was not being begunwere not being begun
wasn't being begunweren't being begun
Ihe/she/itwe/you/they
am being begunis being begunare being begun
---
am not being begunis not being begunare not being begun
 isn't being begunare'nt being begun
Завершенность - Perfect
I/he/she/it/we/you/they
had been begun
---
had not been begun
hadn't been begun
I/we/you/theyhe/she/it
have begunhas begun
---
have not begunhas not begun
haven't begunhasn't begun
I/he/she/it/we/you/they
will have been begun
---
will not have been begun
won't have been begun
Вместо отсутствующих форм Perfect Continuous употребляются формы Perfect
begin -> начинать