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 cannot yawn you cannot yawn he cannot yawn we cannot yawn you cannot yawn they cannot yawn
Forma com V-ing
I cannot be yawning you cannot be yawning he cannot be yawning we cannot be yawning you cannot be yawning they cannot be yawning
Perfeito
I cannot have yawned you cannot have yawned he cannot have yawned we cannot have yawned you cannot have yawned they cannot have yawned
Perfeito com V-ing
I cannot have been yawning you cannot have been yawning he cannot have been yawning we cannot have been yawning you cannot have been yawning they cannot 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 I not yawn? can you not yawn? can he not yawn? can we not yawn? can you not yawn? can they not yawn?
Forma com V-ing
can I not be yawning? can you not be yawning? can he not be yawning? can we not be yawning? can you not be yawning? can they not be yawning?
Perfeito
can I not have yawned? can you not have yawned? can he not have yawned? can we not have yawned? can you not have yawned? can they not have yawned?
Perfeito com V-ing
can I not have been yawning? can you not have been yawning? can he not have been yawning? can we not have been yawning? can you not have been yawning? can they not have been yawning?