could abbreviate
Regular verb: abbreviate - abbreviated- abbreviated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could abbreviate
you could abbreviate
she could abbreviate
we could abbreviate
you could abbreviate
they could abbreviate 	I could be abbreviating
you could be abbreviating
she could be abbreviating
we could be abbreviating
you could be abbreviating
they could be abbreviating	I could have abbreviated
you could have abbreviated
she could have abbreviated
we could have abbreviated
you could have abbreviated
they could have abbreviated	I could have been abbreviating
you could have been abbreviating
she could have been abbreviating
we could have been abbreviating
you could have been abbreviating
they could have been abbreviating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't abbreviate
you couldn't abbreviate
she couldn't abbreviate
we couldn't abbreviate
you couldn't abbreviate
they couldn't abbreviate 	I couldn't be abbreviating
you couldn't be abbreviating
she couldn't be abbreviating
we couldn't be abbreviating
you couldn't be abbreviating
they couldn't be abbreviating	I couldn't have abbreviated
you couldn't have abbreviated
she couldn't have abbreviated
we couldn't have abbreviated
you couldn't have abbreviated
they couldn't have abbreviated	I couldn't have been abbreviating
you couldn't have been abbreviating
she couldn't have been abbreviating
we couldn't have been abbreviating
you couldn't have been abbreviating
they couldn't have been abbreviating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I abbreviate?
could you abbreviate?
could she abbreviate?
could we abbreviate?
could you abbreviate?
could they abbreviate? 	could I be abbreviating?
could you be abbreviating?
could she be abbreviating?
could we be abbreviating?
could you be abbreviating?
could they be abbreviating? 	could I have abbreviated?
could you have abbreviated?
could she have abbreviated?
could we have abbreviated?
could you have abbreviated?
could they have abbreviated? 	could I have been abbreviating?
could you have been abbreviating?
could she have been abbreviating?
could we have been abbreviating?
could you have been abbreviating?
could they have been abbreviating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I abbreviate?
couldn't you abbreviate?
couldn't she abbreviate?
couldn't we abbreviate?
couldn't you abbreviate?
couldn't they abbreviate? 	couldn't I be abbreviating?
couldn't you be abbreviating?
couldn't she be abbreviating?
couldn't we be abbreviating?
couldn't you be abbreviating?
couldn't they be abbreviating? 	couldn't I have abbreviated?
couldn't you have abbreviated?
couldn't she have abbreviated?
couldn't we have abbreviated?
couldn't you have abbreviated?
couldn't they have abbreviated? 	couldn't I have been abbreviating?
couldn't you have been abbreviating?
couldn't she have been abbreviating?
couldn't we have been abbreviating?
couldn't you have been abbreviating?
couldn't they have been abbreviating?