could vowelize
Regular verb: vowelize - vowelized- vowelized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could vowelize
you could vowelize
she could vowelize
we could vowelize
you could vowelize
they could vowelize 	I could be vowelizing
you could be vowelizing
she could be vowelizing
we could be vowelizing
you could be vowelizing
they could be vowelizing	I could have vowelized
you could have vowelized
she could have vowelized
we could have vowelized
you could have vowelized
they could have vowelized	I could have been vowelizing
you could have been vowelizing
she could have been vowelizing
we could have been vowelizing
you could have been vowelizing
they could have been vowelizing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't vowelize
you couldn't vowelize
she couldn't vowelize
we couldn't vowelize
you couldn't vowelize
they couldn't vowelize 	I couldn't be vowelizing
you couldn't be vowelizing
she couldn't be vowelizing
we couldn't be vowelizing
you couldn't be vowelizing
they couldn't be vowelizing	I couldn't have vowelized
you couldn't have vowelized
she couldn't have vowelized
we couldn't have vowelized
you couldn't have vowelized
they couldn't have vowelized	I couldn't have been vowelizing
you couldn't have been vowelizing
she couldn't have been vowelizing
we couldn't have been vowelizing
you couldn't have been vowelizing
they couldn't have been vowelizing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I vowelize?
could you vowelize?
could she vowelize?
could we vowelize?
could you vowelize?
could they vowelize? 	could I be vowelizing?
could you be vowelizing?
could she be vowelizing?
could we be vowelizing?
could you be vowelizing?
could they be vowelizing? 	could I have vowelized?
could you have vowelized?
could she have vowelized?
could we have vowelized?
could you have vowelized?
could they have vowelized? 	could I have been vowelizing?
could you have been vowelizing?
could she have been vowelizing?
could we have been vowelizing?
could you have been vowelizing?
could they have been vowelizing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I vowelize?
couldn't you vowelize?
couldn't she vowelize?
couldn't we vowelize?
couldn't you vowelize?
couldn't they vowelize? 	couldn't I be vowelizing?
couldn't you be vowelizing?
couldn't she be vowelizing?
couldn't we be vowelizing?
couldn't you be vowelizing?
couldn't they be vowelizing? 	couldn't I have vowelized?
couldn't you have vowelized?
couldn't she have vowelized?
couldn't we have vowelized?
couldn't you have vowelized?
couldn't they have vowelized? 	couldn't I have been vowelizing?
couldn't you have been vowelizing?
couldn't she have been vowelizing?
couldn't we have been vowelizing?
couldn't you have been vowelizing?
couldn't they have been vowelizing?