English verb conjugation
COULD EXPOUND

Regular verb: expound - expounded - expounded

Affirmation

Simple form	V-ing form
I could expound you could expound he could expound we could expound you could expound they could expound	I could be expounding you could be expounding he could be expounding we could be expounding you could be expounding they could be expounding
Perfect	V-ing perfect
I could have expounded you could have expounded he could have expounded we could have expounded you could have expounded they could have expounded	I could have been expounding you could have been expounding he could have been expounding we could have been expounding you could have been expounding they could have been expounding

Negation

Simple form	V-ing form
I couldn't expound you couldn't expound he couldn't expound we couldn't expound you couldn't expound they couldn't expound	I couldn't be expounding you couldn't be expounding he couldn't be expounding we couldn't be expounding you couldn't be expounding they couldn't be expounding
Perfect	V-ing perfect
I couldn't have expounded you couldn't have expounded he couldn't have expounded we couldn't have expounded you couldn't have expounded they couldn't have expounded	I couldn't have been expounding you couldn't have been expounding he couldn't have been expounding we couldn't have been expounding you couldn't have been expounding they couldn't have been expounding

Interrogative form

Simple form	V-ing form
could I expound? could you expound? could he expound? could we expound? could you expound? could they expound?	could I be expounding? could you be expounding? could he be expounding? could we be expounding? could you be expounding? could they be expounding?
Perfect	V-ing perfect
could I have expounded? could you have expounded? could he have expounded? could we have expounded? could you have expounded? could they have expounded?	could I have been expounding? could you have been expounding? could he have been expounding? could we have been expounding? could you have been expounding? could they have been expounding?

Interro-negative form

Simple form	V-ing form
couldn't I expound? couldn't you expound? couldn't he expound? couldn't we expound? couldn't you expound? couldn't they expound?	couldn't I be expounding? couldn't you be expounding? couldn't he be expounding? couldn't we be expounding? couldn't you be expounding? couldn't they be expounding?
Perfect	V-ing perfect
couldn't I have expounded? couldn't you have expounded? couldn't he have expounded? couldn't we have expounded? couldn't you have expounded? couldn't they have expounded?	couldn't I have been expounding? couldn't you have been expounding? couldn't he have been expounding? couldn't we have been expounding? couldn't you have been expounding? couldn't they have been expounding?