can titter
Verbo regular: titter - tittered- tittered

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can titter
you can titter
he can titter
we can titter
you can titter
they can titter 	I can be tittering
you can be tittering
he can be tittering
we can be tittering
you can be tittering
they can be tittering	I can have tittered
you can have tittered
he can have tittered
we can have tittered
you can have tittered
they can have tittered	I can have been tittering
you can have been tittering
he can have been tittering
we can have been tittering
you can have been tittering
they can have been tittering	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I cannot titter
you cannot titter
he cannot titter
we cannot titter
you cannot titter
they cannot titter 	I cannot be tittering
you cannot be tittering
he cannot be tittering
we cannot be tittering
you cannot be tittering
they cannot be tittering	I cannot have tittered
you cannot have tittered
he cannot have tittered
we cannot have tittered
you cannot have tittered
they cannot have tittered	I cannot have been tittering
you cannot have been tittering
he cannot have been tittering
we cannot have been tittering
you cannot have been tittering
they cannot have been tittering	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can I titter?
can you titter?
can he titter?
can we titter?
can you titter?
can they titter? 	can I be tittering?
can you be tittering?
can he be tittering?
can we be tittering?
can you be tittering?
can they be tittering? 	can I have tittered?
can you have tittered?
can he have tittered?
can we have tittered?
can you have tittered?
can they have tittered? 	can I have been tittering?
can you have been tittering?
can he have been tittering?
can we have been tittering?
can you have been tittering?
can they have been tittering? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can I not titter?
can you not titter?
can he not titter?
can we not titter?
can you not titter?
can they not titter? 	can I not be tittering?
can you not be tittering?
can he not be tittering?
can we not be tittering?
can you not be tittering?
can they not be tittering? 	can I not have tittered?
can you not have tittered?
can he not have tittered?
can we not have tittered?
can you not have tittered?
can they not have tittered? 	can I not have been tittering?
can you not have been tittering?
can he not have been tittering?
can we not have been tittering?
can you not have been tittering?
can they not have been tittering?