can roof
Verbo regular: roof - roofed- roofed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can roof
you can roof
he can roof
we can roof
you can roof
they can roof 	I can be roofing
you can be roofing
he can be roofing
we can be roofing
you can be roofing
they can be roofing	I can have roofed
you can have roofed
he can have roofed
we can have roofed
you can have roofed
they can have roofed	I can have been roofing
you can have been roofing
he can have been roofing
we can have been roofing
you can have been roofing
they can have been roofing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can't roof
you can't roof
he can't roof
we can't roof
you can't roof
they can't roof 	I can't be roofing
you can't be roofing
he can't be roofing
we can't be roofing
you can't be roofing
they can't be roofing	I can't have roofed
you can't have roofed
he can't have roofed
we can't have roofed
you can't have roofed
they can't have roofed	I can't have been roofing
you can't have been roofing
he can't have been roofing
we can't have been roofing
you can't have been roofing
they can't have been roofing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can I roof?
can you roof?
can he roof?
can we roof?
can you roof?
can they roof? 	can I be roofing?
can you be roofing?
can he be roofing?
can we be roofing?
can you be roofing?
can they be roofing? 	can I have roofed?
can you have roofed?
can he have roofed?
can we have roofed?
can you have roofed?
can they have roofed? 	can I have been roofing?
can you have been roofing?
can he have been roofing?
can we have been roofing?
can you have been roofing?
can they have been roofing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can't I roof?
can't you roof?
can't he roof?
can't we roof?
can't you roof?
can't they roof? 	can't I be roofing?
can't you be roofing?
can't he be roofing?
can't we be roofing?
can't you be roofing?
can't they be roofing? 	can't I have roofed?
can't you have roofed?
can't he have roofed?
can't we have roofed?
can't you have roofed?
can't they have roofed? 	can't I have been roofing?
can't you have been roofing?
can't he have been roofing?
can't we have been roofing?
can't you have been roofing?
can't they have been roofing?