could affix
Regular verb: affix - affixed- affixed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could affix
you could affix
she could affix
we could affix
you could affix
they could affix 	I could be affixing
you could be affixing
she could be affixing
we could be affixing
you could be affixing
they could be affixing	I could have affixed
you could have affixed
she could have affixed
we could have affixed
you could have affixed
they could have affixed	I could have been affixing
you could have been affixing
she could have been affixing
we could have been affixing
you could have been affixing
they could have been affixing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't affix
you couldn't affix
she couldn't affix
we couldn't affix
you couldn't affix
they couldn't affix 	I couldn't be affixing
you couldn't be affixing
she couldn't be affixing
we couldn't be affixing
you couldn't be affixing
they couldn't be affixing	I couldn't have affixed
you couldn't have affixed
she couldn't have affixed
we couldn't have affixed
you couldn't have affixed
they couldn't have affixed	I couldn't have been affixing
you couldn't have been affixing
she couldn't have been affixing
we couldn't have been affixing
you couldn't have been affixing
they couldn't have been affixing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I affix?
could you affix?
could she affix?
could we affix?
could you affix?
could they affix? 	could I be affixing?
could you be affixing?
could she be affixing?
could we be affixing?
could you be affixing?
could they be affixing? 	could I have affixed?
could you have affixed?
could she have affixed?
could we have affixed?
could you have affixed?
could they have affixed? 	could I have been affixing?
could you have been affixing?
could she have been affixing?
could we have been affixing?
could you have been affixing?
could they have been affixing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I affix?
couldn't you affix?
couldn't she affix?
couldn't we affix?
couldn't you affix?
couldn't they affix? 	couldn't I be affixing?
couldn't you be affixing?
couldn't she be affixing?
couldn't we be affixing?
couldn't you be affixing?
couldn't they be affixing? 	couldn't I have affixed?
couldn't you have affixed?
couldn't she have affixed?
couldn't we have affixed?
couldn't you have affixed?
couldn't they have affixed? 	couldn't I have been affixing?
couldn't you have been affixing?
couldn't she have been affixing?
couldn't we have been affixing?
couldn't you have been affixing?
couldn't they have been affixing?