English verb conjugation
COULD CONVINCE

Regular verb: convince - convinced - convinced

Affirmation

Simple form	V-ing form
I could convince you could convince he could convince we could convince you could convince they could convince	I could be convincing you could be convincing he could be convincing we could be convincing you could be convincing they could be convincing
Perfect	V-ing perfect
I could have convinced you could have convinced he could have convinced we could have convinced you could have convinced they could have convinced	I could have been convincing you could have been convincing he could have been convincing we could have been convincing you could have been convincing they could have been convincing

Negation

Simple form	V-ing form
I couldn't convince you couldn't convince he couldn't convince we couldn't convince you couldn't convince they couldn't convince	I couldn't be convincing you couldn't be convincing he couldn't be convincing we couldn't be convincing you couldn't be convincing they couldn't be convincing
Perfect	V-ing perfect
I couldn't have convinced you couldn't have convinced he couldn't have convinced we couldn't have convinced you couldn't have convinced they couldn't have convinced	I couldn't have been convincing you couldn't have been convincing he couldn't have been convincing we couldn't have been convincing you couldn't have been convincing they couldn't have been convincing

Interrogative form

Simple form	V-ing form
could I convince? could you convince? could he convince? could we convince? could you convince? could they convince?	could I be convincing? could you be convincing? could he be convincing? could we be convincing? could you be convincing? could they be convincing?
Perfect	V-ing perfect
could I have convinced? could you have convinced? could he have convinced? could we have convinced? could you have convinced? could they have convinced?	could I have been convincing? could you have been convincing? could he have been convincing? could we have been convincing? could you have been convincing? could they have been convincing?

Interro-negative form

Simple form	V-ing form
couldn't I convince? couldn't you convince? couldn't he convince? couldn't we convince? couldn't you convince? couldn't they convince?	couldn't I be convincing? couldn't you be convincing? couldn't he be convincing? couldn't we be convincing? couldn't you be convincing? couldn't they be convincing?
Perfect	V-ing perfect
couldn't I have convinced? couldn't you have convinced? couldn't he have convinced? couldn't we have convinced? couldn't you have convinced? couldn't they have convinced?	couldn't I have been convincing? couldn't you have been convincing? couldn't he have been convincing? couldn't we have been convincing? couldn't you have been convincing? couldn't they have been convincing?