keep -> содержать
Образование времен: Субъект подвергается (Пассив, или иначе страдательный залог)
  Past - ПрошлоеPresent - НастоящееFuture - Будущее
Факт - Simple
I/he/she/itwe/you/they
was keptwere kept
---
was not keptwere not kept
wasn't keptweren't kept
Ihe/she/itwe/you/they
am keptis keptare kept
---
am not keptis not keptare not kept
 isn't keptare'nt kept
I/he/she/it/we/you/they
will be kept
---
will not be kept
won't be kept
Процесс - Continuous
I/he/she/itwe/you/they
was being keptwere being kept
---
was not being keptwere not being kept
wasn't being keptweren't being kept
Ihe/she/itwe/you/they
am being keptis being keptare being kept
---
am not being keptis not being keptare not being kept
 isn't being keptare'nt being kept
Завершенность - Perfect
I/he/she/it/we/you/they
had been kept
---
had not been kept
hadn't been kept
I/we/you/theyhe/she/it
have kepthas kept
---
have not kepthas not kept
haven't kepthasn't kept
I/he/she/it/we/you/they
will have been kept
---
will not have been kept
won't have been kept
Вместо отсутствующих форм Perfect Continuous употребляются формы Perfect
keep -> содержать