English verb conjugation
COULD SYNCHRONIZE

Regular verb: synchronize - synchronized - synchronized

Affirmation

Simple form	V-ing form
I could synchronize you could synchronize he could synchronize we could synchronize you could synchronize they could synchronize	I could be synchronizing you could be synchronizing he could be synchronizing we could be synchronizing you could be synchronizing they could be synchronizing
Perfect	V-ing perfect
I could have synchronized you could have synchronized he could have synchronized we could have synchronized you could have synchronized they could have synchronized	I could have been synchronizing you could have been synchronizing he could have been synchronizing we could have been synchronizing you could have been synchronizing they could have been synchronizing

Negation

Simple form	V-ing form
I couldn't synchronize you couldn't synchronize he couldn't synchronize we couldn't synchronize you couldn't synchronize they couldn't synchronize	I couldn't be synchronizing you couldn't be synchronizing he couldn't be synchronizing we couldn't be synchronizing you couldn't be synchronizing they couldn't be synchronizing
Perfect	V-ing perfect
I couldn't have synchronized you couldn't have synchronized he couldn't have synchronized we couldn't have synchronized you couldn't have synchronized they couldn't have synchronized	I couldn't have been synchronizing you couldn't have been synchronizing he couldn't have been synchronizing we couldn't have been synchronizing you couldn't have been synchronizing they couldn't have been synchronizing

Interrogative form

Simple form	V-ing form
could I synchronize? could you synchronize? could he synchronize? could we synchronize? could you synchronize? could they synchronize?	could I be synchronizing? could you be synchronizing? could he be synchronizing? could we be synchronizing? could you be synchronizing? could they be synchronizing?
Perfect	V-ing perfect
could I have synchronized? could you have synchronized? could he have synchronized? could we have synchronized? could you have synchronized? could they have synchronized?	could I have been synchronizing? could you have been synchronizing? could he have been synchronizing? could we have been synchronizing? could you have been synchronizing? could they have been synchronizing?

Interro-negative form

Simple form	V-ing form
couldn't I synchronize? couldn't you synchronize? couldn't he synchronize? couldn't we synchronize? couldn't you synchronize? couldn't they synchronize?	couldn't I be synchronizing? couldn't you be synchronizing? couldn't he be synchronizing? couldn't we be synchronizing? couldn't you be synchronizing? couldn't they be synchronizing?
Perfect	V-ing perfect
couldn't I have synchronized? couldn't you have synchronized? couldn't he have synchronized? couldn't we have synchronized? couldn't you have synchronized? couldn't they have synchronized?	couldn't I have been synchronizing? couldn't you have been synchronizing? couldn't he have been synchronizing? couldn't we have been synchronizing? couldn't you have been synchronizing? couldn't they have been synchronizing?