could mildew
Regular verb: mildew - mildewed- mildewed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could mildew
you could mildew
he could mildew
we could mildew
you could mildew
they could mildew 	I could be mildewing
you could be mildewing
he could be mildewing
we could be mildewing
you could be mildewing
they could be mildewing	I could have mildewed
you could have mildewed
he could have mildewed
we could have mildewed
you could have mildewed
they could have mildewed	I could have been mildewing
you could have been mildewing
he could have been mildewing
we could have been mildewing
you could have been mildewing
they could have been mildewing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't mildew
you couldn't mildew
he couldn't mildew
we couldn't mildew
you couldn't mildew
they couldn't mildew 	I couldn't be mildewing
you couldn't be mildewing
he couldn't be mildewing
we couldn't be mildewing
you couldn't be mildewing
they couldn't be mildewing	I couldn't have mildewed
you couldn't have mildewed
he couldn't have mildewed
we couldn't have mildewed
you couldn't have mildewed
they couldn't have mildewed	I couldn't have been mildewing
you couldn't have been mildewing
he couldn't have been mildewing
we couldn't have been mildewing
you couldn't have been mildewing
they couldn't have been mildewing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I mildew?
could you mildew?
could he mildew?
could we mildew?
could you mildew?
could they mildew? 	could I be mildewing?
could you be mildewing?
could he be mildewing?
could we be mildewing?
could you be mildewing?
could they be mildewing? 	could I have mildewed?
could you have mildewed?
could he have mildewed?
could we have mildewed?
could you have mildewed?
could they have mildewed? 	could I have been mildewing?
could you have been mildewing?
could he have been mildewing?
could we have been mildewing?
could you have been mildewing?
could they have been mildewing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I mildew?
couldn't you mildew?
couldn't he mildew?
couldn't we mildew?
couldn't you mildew?
couldn't they mildew? 	couldn't I be mildewing?
couldn't you be mildewing?
couldn't he be mildewing?
couldn't we be mildewing?
couldn't you be mildewing?
couldn't they be mildewing? 	couldn't I have mildewed?
couldn't you have mildewed?
couldn't he have mildewed?
couldn't we have mildewed?
couldn't you have mildewed?
couldn't they have mildewed? 	couldn't I have been mildewing?
couldn't you have been mildewing?
couldn't he have been mildewing?
couldn't we have been mildewing?
couldn't you have been mildewing?
couldn't they have been mildewing?