could trail
Verbo regular: trail - trailed- trailed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could trail
you could trail
he could trail
we could trail
you could trail
they could trail 	I could be trailing
you could be trailing
he could be trailing
we could be trailing
you could be trailing
they could be trailing	I could have trailed
you could have trailed
he could have trailed
we could have trailed
you could have trailed
they could have trailed	I could have been trailing
you could have been trailing
he could have been trailing
we could have been trailing
you could have been trailing
they could have been trailing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not trail
you could not trail
he could not trail
we could not trail
you could not trail
they could not trail 	I could not be trailing
you could not be trailing
he could not be trailing
we could not be trailing
you could not be trailing
they could not be trailing	I could not have trailed
you could not have trailed
he could not have trailed
we could not have trailed
you could not have trailed
they could not have trailed	I could not have been trailing
you could not have been trailing
he could not have been trailing
we could not have been trailing
you could not have been trailing
they could not have been trailing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I trail?
could you trail?
could he trail?
could we trail?
could you trail?
could they trail? 	could I be trailing?
could you be trailing?
could he be trailing?
could we be trailing?
could you be trailing?
could they be trailing? 	could I have trailed?
could you have trailed?
could he have trailed?
could we have trailed?
could you have trailed?
could they have trailed? 	could I have been trailing?
could you have been trailing?
could he have been trailing?
could we have been trailing?
could you have been trailing?
could they have been trailing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not trail?
could you not trail?
could he not trail?
could we not trail?
could you not trail?
could they not trail? 	could I not be trailing?
could you not be trailing?
could he not be trailing?
could we not be trailing?
could you not be trailing?
could they not be trailing? 	could I not have trailed?
could you not have trailed?
could he not have trailed?
could we not have trailed?
could you not have trailed?
could they not have trailed? 	could I not have been trailing?
could you not have been trailing?
could he not have been trailing?
could we not have been trailing?
could you not have been trailing?
could they not have been trailing?