could lecture
Regular verb: lecture - lectured- lectured

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could lecture
you could lecture
she could lecture
we could lecture
you could lecture
they could lecture 	I could be lecturing
you could be lecturing
she could be lecturing
we could be lecturing
you could be lecturing
they could be lecturing	I could have lectured
you could have lectured
she could have lectured
we could have lectured
you could have lectured
they could have lectured	I could have been lecturing
you could have been lecturing
she could have been lecturing
we could have been lecturing
you could have been lecturing
they could have been lecturing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not lecture
you could not lecture
she could not lecture
we could not lecture
you could not lecture
they could not lecture 	I could not be lecturing
you could not be lecturing
she could not be lecturing
we could not be lecturing
you could not be lecturing
they could not be lecturing	I could not have lectured
you could not have lectured
she could not have lectured
we could not have lectured
you could not have lectured
they could not have lectured	I could not have been lecturing
you could not have been lecturing
she could not have been lecturing
we could not have been lecturing
you could not have been lecturing
they could not have been lecturing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I lecture?
could you lecture?
could she lecture?
could we lecture?
could you lecture?
could they lecture? 	could I be lecturing?
could you be lecturing?
could she be lecturing?
could we be lecturing?
could you be lecturing?
could they be lecturing? 	could I have lectured?
could you have lectured?
could she have lectured?
could we have lectured?
could you have lectured?
could they have lectured? 	could I have been lecturing?
could you have been lecturing?
could she have been lecturing?
could we have been lecturing?
could you have been lecturing?
could they have been lecturing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not lecture?
could you not lecture?
could she not lecture?
could we not lecture?
could you not lecture?
could they not lecture? 	could I not be lecturing?
could you not be lecturing?
could she not be lecturing?
could we not be lecturing?
could you not be lecturing?
could they not be lecturing? 	could I not have lectured?
could you not have lectured?
could she not have lectured?
could we not have lectured?
could you not have lectured?
could they not have lectured? 	could I not have been lecturing?
could you not have been lecturing?
could she not have been lecturing?
could we not have been lecturing?
could you not have been lecturing?
could they not have been lecturing?