can expound
Regular verb: expound - expounded- expounded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?