stay -> оставаться
Образование времен: Субъект подвергается (Пассив, или иначе страдательный залог)
  Past - ПрошлоеPresent - НастоящееFuture - Будущее
Факт - Simple
I/he/she/itwe/you/they
was staidwere staid
---
was not staidwere not staid
wasn't staidweren't staid
Ihe/she/itwe/you/they
am staidis staidare staid
---
am not staidis not staidare not staid
 isn't staidare'nt staid
I/he/she/it/we/you/they
will be staid
---
will not be staid
won't be staid
Процесс - Continuous
I/he/she/itwe/you/they
was being staidwere being staid
---
was not being staidwere not being staid
wasn't being staidweren't being staid
Ihe/she/itwe/you/they
am being staidis being staidare being staid
---
am not being staidis not being staidare not being staid
 isn't being staidare'nt being staid
Завершенность - Perfect
I/he/she/it/we/you/they
had been staid
---
had not been staid
hadn't been staid
I/we/you/theyhe/she/it
have staidhas staid
---
have not staidhas not staid
haven't staidhasn't staid
I/he/she/it/we/you/they
will have been staid
---
will not have been staid
won't have been staid
Вместо отсутствующих форм Perfect Continuous употребляются формы Perfect
stay -> оставаться