can prefix
Verbo regular: prefix - prefixed- prefixed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can prefix
you can prefix
he can prefix
we can prefix
you can prefix
they can prefix 	I can be prefixing
you can be prefixing
he can be prefixing
we can be prefixing
you can be prefixing
they can be prefixing	I can have prefixed
you can have prefixed
he can have prefixed
we can have prefixed
you can have prefixed
they can have prefixed	I can have been prefixing
you can have been prefixing
he can have been prefixing
we can have been prefixing
you can have been prefixing
they can have been prefixing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I cannot prefix
you cannot prefix
he cannot prefix
we cannot prefix
you cannot prefix
they cannot prefix 	I cannot be prefixing
you cannot be prefixing
he cannot be prefixing
we cannot be prefixing
you cannot be prefixing
they cannot be prefixing	I cannot have prefixed
you cannot have prefixed
he cannot have prefixed
we cannot have prefixed
you cannot have prefixed
they cannot have prefixed	I cannot have been prefixing
you cannot have been prefixing
he cannot have been prefixing
we cannot have been prefixing
you cannot have been prefixing
they cannot have been prefixing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can I prefix?
can you prefix?
can he prefix?
can we prefix?
can you prefix?
can they prefix? 	can I be prefixing?
can you be prefixing?
can he be prefixing?
can we be prefixing?
can you be prefixing?
can they be prefixing? 	can I have prefixed?
can you have prefixed?
can he have prefixed?
can we have prefixed?
can you have prefixed?
can they have prefixed? 	can I have been prefixing?
can you have been prefixing?
can he have been prefixing?
can we have been prefixing?
can you have been prefixing?
can they have been prefixing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can I not prefix?
can you not prefix?
can he not prefix?
can we not prefix?
can you not prefix?
can they not prefix? 	can I not be prefixing?
can you not be prefixing?
can he not be prefixing?
can we not be prefixing?
can you not be prefixing?
can they not be prefixing? 	can I not have prefixed?
can you not have prefixed?
can he not have prefixed?
can we not have prefixed?
can you not have prefixed?
can they not have prefixed? 	can I not have been prefixing?
can you not have been prefixing?
can he not have been prefixing?
can we not have been prefixing?
can you not have been prefixing?
can they not have been prefixing?