could abbreviate
Regular verb: abbreviate - abbreviated- abbreviated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could abbreviate
you could abbreviate
he could abbreviate
we could abbreviate
you could abbreviate
they could abbreviate 	I could be abbreviating
you could be abbreviating
he could be abbreviating
we could be abbreviating
you could be abbreviating
they could be abbreviating	I could have abbreviated
you could have abbreviated
he 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
he 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
he 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
he 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
he 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
he 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 he abbreviate?
could we abbreviate?
could you abbreviate?
could they abbreviate? 	could I be abbreviating?
could you be abbreviating?
could he be abbreviating?
could we be abbreviating?
could you be abbreviating?
could they be abbreviating? 	could I have abbreviated?
could you have abbreviated?
could he 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 he 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 he 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 he 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 he 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 he have been abbreviating?
couldn't we have been abbreviating?
couldn't you have been abbreviating?
couldn't they have been abbreviating?