could singularize
Regular verb: singularize - singularized- singularized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could singularize
you could singularize
he could singularize
we could singularize
you could singularize
they could singularize 	I could be singularizing
you could be singularizing
he could be singularizing
we could be singularizing
you could be singularizing
they could be singularizing	I could have singularized
you could have singularized
he could have singularized
we could have singularized
you could have singularized
they could have singularized	I could have been singularizing
you could have been singularizing
he could have been singularizing
we could have been singularizing
you could have been singularizing
they could have been singularizing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not singularize
you could not singularize
he could not singularize
we could not singularize
you could not singularize
they could not singularize 	I could not be singularizing
you could not be singularizing
he could not be singularizing
we could not be singularizing
you could not be singularizing
they could not be singularizing	I could not have singularized
you could not have singularized
he could not have singularized
we could not have singularized
you could not have singularized
they could not have singularized	I could not have been singularizing
you could not have been singularizing
he could not have been singularizing
we could not have been singularizing
you could not have been singularizing
they could not have been singularizing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I singularize?
could you singularize?
could he singularize?
could we singularize?
could you singularize?
could they singularize? 	could I be singularizing?
could you be singularizing?
could he be singularizing?
could we be singularizing?
could you be singularizing?
could they be singularizing? 	could I have singularized?
could you have singularized?
could he have singularized?
could we have singularized?
could you have singularized?
could they have singularized? 	could I have been singularizing?
could you have been singularizing?
could he have been singularizing?
could we have been singularizing?
could you have been singularizing?
could they have been singularizing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not singularize?
could you not singularize?
could he not singularize?
could we not singularize?
could you not singularize?
could they not singularize? 	could I not be singularizing?
could you not be singularizing?
could he not be singularizing?
could we not be singularizing?
could you not be singularizing?
could they not be singularizing? 	could I not have singularized?
could you not have singularized?
could he not have singularized?
could we not have singularized?
could you not have singularized?
could they not have singularized? 	could I not have been singularizing?
could you not have been singularizing?
could he not have been singularizing?
could we not have been singularizing?
could you not have been singularizing?
could they not have been singularizing?