could nitride
Regular verb: nitride - nitrided- nitrided

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could nitride
you could nitride
he could nitride
we could nitride
you could nitride
they could nitride 	I could be nitriding
you could be nitriding
he could be nitriding
we could be nitriding
you could be nitriding
they could be nitriding	I could have nitrided
you could have nitrided
he could have nitrided
we could have nitrided
you could have nitrided
they could have nitrided	I could have been nitriding
you could have been nitriding
he could have been nitriding
we could have been nitriding
you could have been nitriding
they could have been nitriding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not nitride
you could not nitride
he could not nitride
we could not nitride
you could not nitride
they could not nitride 	I could not be nitriding
you could not be nitriding
he could not be nitriding
we could not be nitriding
you could not be nitriding
they could not be nitriding	I could not have nitrided
you could not have nitrided
he could not have nitrided
we could not have nitrided
you could not have nitrided
they could not have nitrided	I could not have been nitriding
you could not have been nitriding
he could not have been nitriding
we could not have been nitriding
you could not have been nitriding
they could not have been nitriding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I nitride?
could you nitride?
could he nitride?
could we nitride?
could you nitride?
could they nitride? 	could I be nitriding?
could you be nitriding?
could he be nitriding?
could we be nitriding?
could you be nitriding?
could they be nitriding? 	could I have nitrided?
could you have nitrided?
could he have nitrided?
could we have nitrided?
could you have nitrided?
could they have nitrided? 	could I have been nitriding?
could you have been nitriding?
could he have been nitriding?
could we have been nitriding?
could you have been nitriding?
could they have been nitriding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not nitride?
could you not nitride?
could he not nitride?
could we not nitride?
could you not nitride?
could they not nitride? 	could I not be nitriding?
could you not be nitriding?
could he not be nitriding?
could we not be nitriding?
could you not be nitriding?
could they not be nitriding? 	could I not have nitrided?
could you not have nitrided?
could he not have nitrided?
could we not have nitrided?
could you not have nitrided?
could they not have nitrided? 	could I not have been nitriding?
could you not have been nitriding?
could he not have been nitriding?
could we not have been nitriding?
could you not have been nitriding?
could they not have been nitriding?