yawn -> зевать
Образование времен (Действует субъект! - Актив т.е. действительный залог):
  Past - ПрошлоеPresent - НастоящееFuture - Будущее
Simple - Факт
I/he/she/it/we/you/they
yawned
did yawn
----
did not yawn
didn't yawn
I/we/you/theyhe/she/it
yawnyawns
do yawndoes yawn
----
do not yawndoes not yawn
don't yawndoesn't yawn
I/he/she/it/we/you/they
will yawn
 
----
will not yawn
won't yawn
Continous - процесс
I/he/she/itwe/you/they
was yawningwere yawning
----
was not yawningwere not yawning
Ihe/she/itwe/you/they
am yawningis yawningare yawning
----
am not yawningis not yawningare not yawning
  isn't yawningaren't yawning
I/he/she/it/we/you/they
will be yawn
----
will not be yawn
won't be yawn
Perfect - Завершенность
I/he/she/it/we/you/they
had yawned
----
had not yawned
hadn't 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 be yawned
----
will not be yawned
won't be yawned
Perfect Continous - Процесс в периоде
I/he/she/it/we/you/they
had been yawning
I/we/you/theyhe/she/it
have been yawninghas been yawning
I/he/she/it/we/you/they
will have been yawning
yawn -> зевать