could mongrelize
Regular verb: mongrelize - mongrelized- mongrelized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could mongrelize
you could mongrelize
she could mongrelize
we could mongrelize
you could mongrelize
they could mongrelize 	I could be mongrelizing
you could be mongrelizing
she could be mongrelizing
we could be mongrelizing
you could be mongrelizing
they could be mongrelizing	I could have mongrelized
you could have mongrelized
she could have mongrelized
we could have mongrelized
you could have mongrelized
they could have mongrelized	I could have been mongrelizing
you could have been mongrelizing
she could have been mongrelizing
we could have been mongrelizing
you could have been mongrelizing
they could have been mongrelizing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't mongrelize
you couldn't mongrelize
she couldn't mongrelize
we couldn't mongrelize
you couldn't mongrelize
they couldn't mongrelize 	I couldn't be mongrelizing
you couldn't be mongrelizing
she couldn't be mongrelizing
we couldn't be mongrelizing
you couldn't be mongrelizing
they couldn't be mongrelizing	I couldn't have mongrelized
you couldn't have mongrelized
she couldn't have mongrelized
we couldn't have mongrelized
you couldn't have mongrelized
they couldn't have mongrelized	I couldn't have been mongrelizing
you couldn't have been mongrelizing
she couldn't have been mongrelizing
we couldn't have been mongrelizing
you couldn't have been mongrelizing
they couldn't have been mongrelizing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I mongrelize?
could you mongrelize?
could she mongrelize?
could we mongrelize?
could you mongrelize?
could they mongrelize? 	could I be mongrelizing?
could you be mongrelizing?
could she be mongrelizing?
could we be mongrelizing?
could you be mongrelizing?
could they be mongrelizing? 	could I have mongrelized?
could you have mongrelized?
could she have mongrelized?
could we have mongrelized?
could you have mongrelized?
could they have mongrelized? 	could I have been mongrelizing?
could you have been mongrelizing?
could she have been mongrelizing?
could we have been mongrelizing?
could you have been mongrelizing?
could they have been mongrelizing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I mongrelize?
couldn't you mongrelize?
couldn't she mongrelize?
couldn't we mongrelize?
couldn't you mongrelize?
couldn't they mongrelize? 	couldn't I be mongrelizing?
couldn't you be mongrelizing?
couldn't she be mongrelizing?
couldn't we be mongrelizing?
couldn't you be mongrelizing?
couldn't they be mongrelizing? 	couldn't I have mongrelized?
couldn't you have mongrelized?
couldn't she have mongrelized?
couldn't we have mongrelized?
couldn't you have mongrelized?
couldn't they have mongrelized? 	couldn't I have been mongrelizing?
couldn't you have been mongrelizing?
couldn't she have been mongrelizing?
couldn't we have been mongrelizing?
couldn't you have been mongrelizing?
couldn't they have been mongrelizing?