I can enlighten you can enlighten he can enlighten we can enlighten you can enlighten they can enlighten
V-ing form
I can be enlightening you can be enlightening he can be enlightening we can be enlightening you can be enlightening they can be enlightening
Perfect
I can have enlightened you can have enlightened he can have enlightened we can have enlightened you can have enlightened they can have enlightened
V-ing perfect
I can have been enlightening you can have been enlightening he can have been enlightening we can have been enlightening you can have been enlightening they can have been enlightening
Negation
Simple form
I can't enlighten you can't enlighten he can't enlighten we can't enlighten you can't enlighten they can't enlighten
V-ing form
I can't be enlightening you can't be enlightening he can't be enlightening we can't be enlightening you can't be enlightening they can't be enlightening
Perfect
I can't have enlightened you can't have enlightened he can't have enlightened we can't have enlightened you can't have enlightened they can't have enlightened
V-ing perfect
I can't have been enlightening you can't have been enlightening he can't have been enlightening we can't have been enlightening you can't have been enlightening they can't have been enlightening
Interrogative form
Simple form
can I enlighten? can you enlighten? can he enlighten? can we enlighten? can you enlighten? can they enlighten?
V-ing form
can I be enlightening? can you be enlightening? can he be enlightening? can we be enlightening? can you be enlightening? can they be enlightening?
Perfect
can I have enlightened? can you have enlightened? can he have enlightened? can we have enlightened? can you have enlightened? can they have enlightened?
V-ing perfect
can I have been enlightening? can you have been enlightening? can he have been enlightening? can we have been enlightening? can you have been enlightening? can they have been enlightening?
Interro-negative form
Simple form
can't I enlighten? can't you enlighten? can't he enlighten? can't we enlighten? can't you enlighten? can't they enlighten?
V-ing form
can't I be enlightening? can't you be enlightening? can't he be enlightening? can't we be enlightening? can't you be enlightening? can't they be enlightening?
Perfect
can't I have enlightened? can't you have enlightened? can't he have enlightened? can't we have enlightened? can't you have enlightened? can't they have enlightened?
V-ing perfect
can't I have been enlightening? can't you have been enlightening? can't he have been enlightening? can't we have been enlightening? can't you have been enlightening? can't they have been enlightening?