yawn -> зевать
Образование времен: Субъект подвергается (Пассив, или иначе страдательный залог)
  Past - ПрошлоеPresent - НастоящееFuture - Будущее
Факт - Simple
I/he/she/itwe/you/they
was yawnedwere yawned
---
was not yawnedwere not yawned
wasn't yawnedweren't yawned
Ihe/she/itwe/you/they
am yawnedis yawnedare yawned
---
am not yawnedis not yawnedare not yawned
 isn't yawnedaren't yawned
I/he/she/it/we/you/they
will be yawned
---
will not be yawned
won't be yawned
Процесс - Continuous
I/he/she/itwe/you/they
was being yawnedwere being yawned
---
was not being yawnedwere not being yawned
wasn't being yawnedweren't being yawned
Ihe/she/itwe/you/they
am being yawnedis being yawnedare being yawned
---
am not being yawnedis not being yawnedare not being yawned
 isn't being yawnedaren't being yawned
Завершенность - Perfect
I/he/she/it/we/you/they
had been yawned
---
had not been yawned
hadn't been yawned
I/we/you/theyhe/she/it
have yawnedhas yawned
---
have not yawnedhas not yawned
haven't yawnedhasn't yawned
I/he/she/it/we/you/they
will have been yawned
---
will not have been yawned
won't have been yawned
Вместо отсутствующих форм Perfect Continuous употребляются формы Perfect
yawn -> зевать