could wax
Regular verb: wax - waxed- waxed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could wax
you could wax
she could wax
we could wax
you could wax
they could wax 	I could be waxing
you could be waxing
she could be waxing
we could be waxing
you could be waxing
they could be waxing	I could have waxed
you could have waxed
she could have waxed
we could have waxed
you could have waxed
they could have waxed	I could have been waxing
you could have been waxing
she could have been waxing
we could have been waxing
you could have been waxing
they could have been waxing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't wax
you couldn't wax
she couldn't wax
we couldn't wax
you couldn't wax
they couldn't wax 	I couldn't be waxing
you couldn't be waxing
she couldn't be waxing
we couldn't be waxing
you couldn't be waxing
they couldn't be waxing	I couldn't have waxed
you couldn't have waxed
she couldn't have waxed
we couldn't have waxed
you couldn't have waxed
they couldn't have waxed	I couldn't have been waxing
you couldn't have been waxing
she couldn't have been waxing
we couldn't have been waxing
you couldn't have been waxing
they couldn't have been waxing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I wax?
could you wax?
could she wax?
could we wax?
could you wax?
could they wax? 	could I be waxing?
could you be waxing?
could she be waxing?
could we be waxing?
could you be waxing?
could they be waxing? 	could I have waxed?
could you have waxed?
could she have waxed?
could we have waxed?
could you have waxed?
could they have waxed? 	could I have been waxing?
could you have been waxing?
could she have been waxing?
could we have been waxing?
could you have been waxing?
could they have been waxing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I wax?
couldn't you wax?
couldn't she wax?
couldn't we wax?
couldn't you wax?
couldn't they wax? 	couldn't I be waxing?
couldn't you be waxing?
couldn't she be waxing?
couldn't we be waxing?
couldn't you be waxing?
couldn't they be waxing? 	couldn't I have waxed?
couldn't you have waxed?
couldn't she have waxed?
couldn't we have waxed?
couldn't you have waxed?
couldn't they have waxed? 	couldn't I have been waxing?
couldn't you have been waxing?
couldn't she have been waxing?
couldn't we have been waxing?
couldn't you have been waxing?
couldn't they have been waxing?