could singularize
Regular verb: singularize - singularized- singularized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could singularize
you could singularize
she could singularize
we could singularize
you could singularize
they could singularize 	I could be singularizing
you could be singularizing
she could be singularizing
we could be singularizing
you could be singularizing
they could be singularizing	I could have singularized
you could have singularized
she 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
she 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 couldn't singularize
you couldn't singularize
she couldn't singularize
we couldn't singularize
you couldn't singularize
they couldn't singularize 	I couldn't be singularizing
you couldn't be singularizing
she couldn't be singularizing
we couldn't be singularizing
you couldn't be singularizing
they couldn't be singularizing	I couldn't have singularized
you couldn't have singularized
she couldn't have singularized
we couldn't have singularized
you couldn't have singularized
they couldn't have singularized	I couldn't have been singularizing
you couldn't have been singularizing
she couldn't have been singularizing
we couldn't have been singularizing
you couldn't have been singularizing
they couldn't have been singularizing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I singularize?
could you singularize?
could she singularize?
could we singularize?
could you singularize?
could they singularize? 	could I be singularizing?
could you be singularizing?
could she be singularizing?
could we be singularizing?
could you be singularizing?
could they be singularizing? 	could I have singularized?
could you have singularized?
could she 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 she 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 	
couldn't I singularize?
couldn't you singularize?
couldn't she singularize?
couldn't we singularize?
couldn't you singularize?
couldn't they singularize? 	couldn't I be singularizing?
couldn't you be singularizing?
couldn't she be singularizing?
couldn't we be singularizing?
couldn't you be singularizing?
couldn't they be singularizing? 	couldn't I have singularized?
couldn't you have singularized?
couldn't she have singularized?
couldn't we have singularized?
couldn't you have singularized?
couldn't they have singularized? 	couldn't I have been singularizing?
couldn't you have been singularizing?
couldn't she have been singularizing?
couldn't we have been singularizing?
couldn't you have been singularizing?
couldn't they have been singularizing?