could stridulate
Verbo regular: stridulate - stridulated- stridulated

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could stridulate
you could stridulate
he could stridulate
we could stridulate
you could stridulate
they could stridulate 	I could be stridulating
you could be stridulating
he could be stridulating
we could be stridulating
you could be stridulating
they could be stridulating	I could have stridulated
you could have stridulated
he could have stridulated
we could have stridulated
you could have stridulated
they could have stridulated	I could have been stridulating
you could have been stridulating
he could have been stridulating
we could have been stridulating
you could have been stridulating
they could have been stridulating	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not stridulate
you could not stridulate
he could not stridulate
we could not stridulate
you could not stridulate
they could not stridulate 	I could not be stridulating
you could not be stridulating
he could not be stridulating
we could not be stridulating
you could not be stridulating
they could not be stridulating	I could not have stridulated
you could not have stridulated
he could not have stridulated
we could not have stridulated
you could not have stridulated
they could not have stridulated	I could not have been stridulating
you could not have been stridulating
he could not have been stridulating
we could not have been stridulating
you could not have been stridulating
they could not have been stridulating	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I stridulate?
could you stridulate?
could he stridulate?
could we stridulate?
could you stridulate?
could they stridulate? 	could I be stridulating?
could you be stridulating?
could he be stridulating?
could we be stridulating?
could you be stridulating?
could they be stridulating? 	could I have stridulated?
could you have stridulated?
could he have stridulated?
could we have stridulated?
could you have stridulated?
could they have stridulated? 	could I have been stridulating?
could you have been stridulating?
could he have been stridulating?
could we have been stridulating?
could you have been stridulating?
could they have been stridulating? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not stridulate?
could you not stridulate?
could he not stridulate?
could we not stridulate?
could you not stridulate?
could they not stridulate? 	could I not be stridulating?
could you not be stridulating?
could he not be stridulating?
could we not be stridulating?
could you not be stridulating?
could they not be stridulating? 	could I not have stridulated?
could you not have stridulated?
could he not have stridulated?
could we not have stridulated?
could you not have stridulated?
could they not have stridulated? 	could I not have been stridulating?
could you not have been stridulating?
could he not have been stridulating?
could we not have been stridulating?
could you not have been stridulating?
could they not have been stridulating?