can tower
Verbo regular: tower - towered- towered

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can tower
you can tower
she can tower
we can tower
you can tower
they can tower 	I can be towering
you can be towering
she can be towering
we can be towering
you can be towering
they can be towering	I can have towered
you can have towered
she can have towered
we can have towered
you can have towered
they can have towered	I can have been towering
you can have been towering
she can have been towering
we can have been towering
you can have been towering
they can have been towering	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I cannot tower
you cannot tower
she cannot tower
we cannot tower
you cannot tower
they cannot tower 	I cannot be towering
you cannot be towering
she cannot be towering
we cannot be towering
you cannot be towering
they cannot be towering	I cannot have towered
you cannot have towered
she cannot have towered
we cannot have towered
you cannot have towered
they cannot have towered	I cannot have been towering
you cannot have been towering
she cannot have been towering
we cannot have been towering
you cannot have been towering
they cannot have been towering	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can I tower?
can you tower?
can she tower?
can we tower?
can you tower?
can they tower? 	can I be towering?
can you be towering?
can she be towering?
can we be towering?
can you be towering?
can they be towering? 	can I have towered?
can you have towered?
can she have towered?
can we have towered?
can you have towered?
can they have towered? 	can I have been towering?
can you have been towering?
can she have been towering?
can we have been towering?
can you have been towering?
can they have been towering? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can I not tower?
can you not tower?
can she not tower?
can we not tower?
can you not tower?
can they not tower? 	can I not be towering?
can you not be towering?
can she not be towering?
can we not be towering?
can you not be towering?
can they not be towering? 	can I not have towered?
can you not have towered?
can she not have towered?
can we not have towered?
can you not have towered?
can they not have towered? 	can I not have been towering?
can you not have been towering?
can she not have been towering?
can we not have been towering?
can you not have been towering?
can they not have been towering?