can dull
Verbo regular: dull - dulled- dulled

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can dull
you can dull
she can dull
we can dull
you can dull
they can dull 	I can be dulling
you can be dulling
she can be dulling
we can be dulling
you can be dulling
they can be dulling	I can have dulled
you can have dulled
she can have dulled
we can have dulled
you can have dulled
they can have dulled	I can have been dulling
you can have been dulling
she can have been dulling
we can have been dulling
you can have been dulling
they can have been dulling	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can't dull
you can't dull
she can't dull
we can't dull
you can't dull
they can't dull 	I can't be dulling
you can't be dulling
she can't be dulling
we can't be dulling
you can't be dulling
they can't be dulling	I can't have dulled
you can't have dulled
she can't have dulled
we can't have dulled
you can't have dulled
they can't have dulled	I can't have been dulling
you can't have been dulling
she can't have been dulling
we can't have been dulling
you can't have been dulling
they can't have been dulling	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can I dull?
can you dull?
can she dull?
can we dull?
can you dull?
can they dull? 	can I be dulling?
can you be dulling?
can she be dulling?
can we be dulling?
can you be dulling?
can they be dulling? 	can I have dulled?
can you have dulled?
can she have dulled?
can we have dulled?
can you have dulled?
can they have dulled? 	can I have been dulling?
can you have been dulling?
can she have been dulling?
can we have been dulling?
can you have been dulling?
can they have been dulling? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can't I dull?
can't you dull?
can't she dull?
can't we dull?
can't you dull?
can't they dull? 	can't I be dulling?
can't you be dulling?
can't she be dulling?
can't we be dulling?
can't you be dulling?
can't they be dulling? 	can't I have dulled?
can't you have dulled?
can't she have dulled?
can't we have dulled?
can't you have dulled?
can't they have dulled? 	can't I have been dulling?
can't you have been dulling?
can't she have been dulling?
can't we have been dulling?
can't you have been dulling?
can't they have been dulling?