could polka
Regular verb: polka - polkaed- polkaed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could polka
you could polka
she could polka
we could polka
you could polka
they could polka 	I could be polkaing
you could be polkaing
she could be polkaing
we could be polkaing
you could be polkaing
they could be polkaing	I could have polkaed
you could have polkaed
she could have polkaed
we could have polkaed
you could have polkaed
they could have polkaed	I could have been polkaing
you could have been polkaing
she could have been polkaing
we could have been polkaing
you could have been polkaing
they could have been polkaing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't polka
you couldn't polka
she couldn't polka
we couldn't polka
you couldn't polka
they couldn't polka 	I couldn't be polkaing
you couldn't be polkaing
she couldn't be polkaing
we couldn't be polkaing
you couldn't be polkaing
they couldn't be polkaing	I couldn't have polkaed
you couldn't have polkaed
she couldn't have polkaed
we couldn't have polkaed
you couldn't have polkaed
they couldn't have polkaed	I couldn't have been polkaing
you couldn't have been polkaing
she couldn't have been polkaing
we couldn't have been polkaing
you couldn't have been polkaing
they couldn't have been polkaing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I polka?
could you polka?
could she polka?
could we polka?
could you polka?
could they polka? 	could I be polkaing?
could you be polkaing?
could she be polkaing?
could we be polkaing?
could you be polkaing?
could they be polkaing? 	could I have polkaed?
could you have polkaed?
could she have polkaed?
could we have polkaed?
could you have polkaed?
could they have polkaed? 	could I have been polkaing?
could you have been polkaing?
could she have been polkaing?
could we have been polkaing?
could you have been polkaing?
could they have been polkaing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I polka?
couldn't you polka?
couldn't she polka?
couldn't we polka?
couldn't you polka?
couldn't they polka? 	couldn't I be polkaing?
couldn't you be polkaing?
couldn't she be polkaing?
couldn't we be polkaing?
couldn't you be polkaing?
couldn't they be polkaing? 	couldn't I have polkaed?
couldn't you have polkaed?
couldn't she have polkaed?
couldn't we have polkaed?
couldn't you have polkaed?
couldn't they have polkaed? 	couldn't I have been polkaing?
couldn't you have been polkaing?
couldn't she have been polkaing?
couldn't we have been polkaing?
couldn't you have been polkaing?
couldn't they have been polkaing?