I can yawn you can yawn he can yawn we can yawn you can yawn they can yawn
Forma com V-ing
I can be yawning you can be yawning he can be yawning we can be yawning you can be yawning they can be yawning
Perfeito
I can have yawned you can have yawned he can have yawned we can have yawned you can have yawned they can have yawned
Perfeito com V-ing
I can have been yawning you can have been yawning he can have been yawning we can have been yawning you can have been yawning they can have been yawning
Negação
Forma simple
I can't yawn you can't yawn he can't yawn we can't yawn you can't yawn they can't yawn
Forma com V-ing
I can't be yawning you can't be yawning he can't be yawning we can't be yawning you can't be yawning they can't be yawning
Perfeito
I can't have yawned you can't have yawned he can't have yawned we can't have yawned you can't have yawned they can't have yawned
Perfeito com V-ing
I can't have been yawning you can't have been yawning he can't have been yawning we can't have been yawning you can't have been yawning they can't have been yawning
Forma interrogativa
Forma simple
can I yawn? can you yawn? can he yawn? can we yawn? can you yawn? can they yawn?
Forma com V-ing
can I be yawning? can you be yawning? can he be yawning? can we be yawning? can you be yawning? can they be yawning?
Perfeito
can I have yawned? can you have yawned? can he have yawned? can we have yawned? can you have yawned? can they have yawned?
Perfeito com V-ing
can I have been yawning? can you have been yawning? can he have been yawning? can we have been yawning? can you have been yawning? can they have been yawning?
Forma interro-Negação
Forma simple
can't I yawn? can't you yawn? can't he yawn? can't we yawn? can't you yawn? can't they yawn?
Forma com V-ing
can't I be yawning? can't you be yawning? can't he be yawning? can't we be yawning? can't you be yawning? can't they be yawning?
Perfeito
can't I have yawned? can't you have yawned? can't he have yawned? can't we have yawned? can't you have yawned? can't they have yawned?
Perfeito com V-ing
can't I have been yawning? can't you have been yawning? can't he have been yawning? can't we have been yawning? can't you have been yawning? can't they have been yawning?