could ventilate
Verbo regular: ventilate - ventilated- ventilated

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could ventilate
you could ventilate
he could ventilate
we could ventilate
you could ventilate
they could ventilate 	I could be ventilating
you could be ventilating
he could be ventilating
we could be ventilating
you could be ventilating
they could be ventilating	I could have ventilated
you could have ventilated
he could have ventilated
we could have ventilated
you could have ventilated
they could have ventilated	I could have been ventilating
you could have been ventilating
he could have been ventilating
we could have been ventilating
you could have been ventilating
they could have been ventilating	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not ventilate
you could not ventilate
he could not ventilate
we could not ventilate
you could not ventilate
they could not ventilate 	I could not be ventilating
you could not be ventilating
he could not be ventilating
we could not be ventilating
you could not be ventilating
they could not be ventilating	I could not have ventilated
you could not have ventilated
he could not have ventilated
we could not have ventilated
you could not have ventilated
they could not have ventilated	I could not have been ventilating
you could not have been ventilating
he could not have been ventilating
we could not have been ventilating
you could not have been ventilating
they could not have been ventilating	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I ventilate?
could you ventilate?
could he ventilate?
could we ventilate?
could you ventilate?
could they ventilate? 	could I be ventilating?
could you be ventilating?
could he be ventilating?
could we be ventilating?
could you be ventilating?
could they be ventilating? 	could I have ventilated?
could you have ventilated?
could he have ventilated?
could we have ventilated?
could you have ventilated?
could they have ventilated? 	could I have been ventilating?
could you have been ventilating?
could he have been ventilating?
could we have been ventilating?
could you have been ventilating?
could they have been ventilating? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not ventilate?
could you not ventilate?
could he not ventilate?
could we not ventilate?
could you not ventilate?
could they not ventilate? 	could I not be ventilating?
could you not be ventilating?
could he not be ventilating?
could we not be ventilating?
could you not be ventilating?
could they not be ventilating? 	could I not have ventilated?
could you not have ventilated?
could he not have ventilated?
could we not have ventilated?
could you not have ventilated?
could they not have ventilated? 	could I not have been ventilating?
could you not have been ventilating?
could he not have been ventilating?
could we not have been ventilating?
could you not have been ventilating?
could they not have been ventilating?