English verb conjugation
CAN EXPOUND

Regular verb: expound - expounded - expounded

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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