English verb conjugation
COULD SUBSPECIALIZE

Regular verb: subspecialize - subspecialized - subspecialized

Affirmation

Simple form	V-ing form
I could subspecialize you could subspecialize he could subspecialize we could subspecialize you could subspecialize they could subspecialize	I could be subspecializing you could be subspecializing he could be subspecializing we could be subspecializing you could be subspecializing they could be subspecializing
Perfect	V-ing perfect
I could have subspecialized you could have subspecialized he could have subspecialized we could have subspecialized you could have subspecialized they could have subspecialized	I could have been subspecializing you could have been subspecializing he could have been subspecializing we could have been subspecializing you could have been subspecializing they could have been subspecializing

Negation

Simple form	V-ing form
I couldn't subspecialize you couldn't subspecialize he couldn't subspecialize we couldn't subspecialize you couldn't subspecialize they couldn't subspecialize	I couldn't be subspecializing you couldn't be subspecializing he couldn't be subspecializing we couldn't be subspecializing you couldn't be subspecializing they couldn't be subspecializing
Perfect	V-ing perfect
I couldn't have subspecialized you couldn't have subspecialized he couldn't have subspecialized we couldn't have subspecialized you couldn't have subspecialized they couldn't have subspecialized	I couldn't have been subspecializing you couldn't have been subspecializing he couldn't have been subspecializing we couldn't have been subspecializing you couldn't have been subspecializing they couldn't have been subspecializing

Interrogative form

Simple form	V-ing form
could I subspecialize? could you subspecialize? could he subspecialize? could we subspecialize? could you subspecialize? could they subspecialize?	could I be subspecializing? could you be subspecializing? could he be subspecializing? could we be subspecializing? could you be subspecializing? could they be subspecializing?
Perfect	V-ing perfect
could I have subspecialized? could you have subspecialized? could he have subspecialized? could we have subspecialized? could you have subspecialized? could they have subspecialized?	could I have been subspecializing? could you have been subspecializing? could he have been subspecializing? could we have been subspecializing? could you have been subspecializing? could they have been subspecializing?

Interro-negative form

Simple form	V-ing form
couldn't I subspecialize? couldn't you subspecialize? couldn't he subspecialize? couldn't we subspecialize? couldn't you subspecialize? couldn't they subspecialize?	couldn't I be subspecializing? couldn't you be subspecializing? couldn't he be subspecializing? couldn't we be subspecializing? couldn't you be subspecializing? couldn't they be subspecializing?
Perfect	V-ing perfect
couldn't I have subspecialized? couldn't you have subspecialized? couldn't he have subspecialized? couldn't we have subspecialized? couldn't you have subspecialized? couldn't they have subspecialized?	couldn't I have been subspecializing? couldn't you have been subspecializing? couldn't he have been subspecializing? couldn't we have been subspecializing? couldn't you have been subspecializing? couldn't they have been subspecializing?