English verb conjugation
COULD EXERT

Regular verb: exert - exerted - exerted

Affirmation

Simple form	V-ing form
I could exert you could exert he could exert we could exert you could exert they could exert	I could be exerting you could be exerting he could be exerting we could be exerting you could be exerting they could be exerting
Perfect	V-ing perfect
I could have exerted you could have exerted he could have exerted we could have exerted you could have exerted they could have exerted	I could have been exerting you could have been exerting he could have been exerting we could have been exerting you could have been exerting they could have been exerting

Negation

Simple form	V-ing form
I couldn't exert you couldn't exert he couldn't exert we couldn't exert you couldn't exert they couldn't exert	I couldn't be exerting you couldn't be exerting he couldn't be exerting we couldn't be exerting you couldn't be exerting they couldn't be exerting
Perfect	V-ing perfect
I couldn't have exerted you couldn't have exerted he couldn't have exerted we couldn't have exerted you couldn't have exerted they couldn't have exerted	I couldn't have been exerting you couldn't have been exerting he couldn't have been exerting we couldn't have been exerting you couldn't have been exerting they couldn't have been exerting

Interrogative form

Simple form	V-ing form
could I exert? could you exert? could he exert? could we exert? could you exert? could they exert?	could I be exerting? could you be exerting? could he be exerting? could we be exerting? could you be exerting? could they be exerting?
Perfect	V-ing perfect
could I have exerted? could you have exerted? could he have exerted? could we have exerted? could you have exerted? could they have exerted?	could I have been exerting? could you have been exerting? could he have been exerting? could we have been exerting? could you have been exerting? could they have been exerting?

Interro-negative form

Simple form	V-ing form
couldn't I exert? couldn't you exert? couldn't he exert? couldn't we exert? couldn't you exert? couldn't they exert?	couldn't I be exerting? couldn't you be exerting? couldn't he be exerting? couldn't we be exerting? couldn't you be exerting? couldn't they be exerting?
Perfect	V-ing perfect
couldn't I have exerted? couldn't you have exerted? couldn't he have exerted? couldn't we have exerted? couldn't you have exerted? couldn't they have exerted?	couldn't I have been exerting? couldn't you have been exerting? couldn't he have been exerting? couldn't we have been exerting? couldn't you have been exerting? couldn't they have been exerting?