I can lecture you can lecture she can lecture we can lecture you can lecture they can lecture
V-ing form
I can be lecturing you can be lecturing she can be lecturing we can be lecturing you can be lecturing they can be lecturing
Perfect
I can have lectured you can have lectured she can have lectured we can have lectured you can have lectured they can have lectured
V-ing perfect
I can have been lecturing you can have been lecturing she can have been lecturing we can have been lecturing you can have been lecturing they can have been lecturing
Negation
Simple form
I can't lecture you can't lecture she can't lecture we can't lecture you can't lecture they can't lecture
V-ing form
I can't be lecturing you can't be lecturing she can't be lecturing we can't be lecturing you can't be lecturing they can't be lecturing
Perfect
I can't have lectured you can't have lectured she can't have lectured we can't have lectured you can't have lectured they can't have lectured
V-ing perfect
I can't have been lecturing you can't have been lecturing she can't have been lecturing we can't have been lecturing you can't have been lecturing they can't have been lecturing
Interrogative form
Simple form
can I lecture? can you lecture? can she lecture? can we lecture? can you lecture? can they lecture?
V-ing form
can I be lecturing? can you be lecturing? can she be lecturing? can we be lecturing? can you be lecturing? can they be lecturing?
Perfect
can I have lectured? can you have lectured? can she have lectured? can we have lectured? can you have lectured? can they have lectured?
V-ing perfect
can I have been lecturing? can you have been lecturing? can she have been lecturing? can we have been lecturing? can you have been lecturing? can they have been lecturing?
Interro-negative form
Simple form
can't I lecture? can't you lecture? can't she lecture? can't we lecture? can't you lecture? can't they lecture?
V-ing form
can't I be lecturing? can't you be lecturing? can't she be lecturing? can't we be lecturing? can't you be lecturing? can't they be lecturing?
Perfect
can't I have lectured? can't you have lectured? can't she have lectured? can't we have lectured? can't you have lectured? can't they have lectured?
V-ing perfect
can't I have been lecturing? can't you have been lecturing? can't she have been lecturing? can't we have been lecturing? can't you have been lecturing? can't they have been lecturing?