I can dampen you can dampen he can dampen we can dampen you can dampen they can dampen
V-ing form
I can be dampening you can be dampening he can be dampening we can be dampening you can be dampening they can be dampening
Perfect
I can have dampened you can have dampened he can have dampened we can have dampened you can have dampened they can have dampened
V-ing perfect
I can have been dampening you can have been dampening he can have been dampening we can have been dampening you can have been dampening they can have been dampening
Negation
Simple form
I cannot dampen you cannot dampen he cannot dampen we cannot dampen you cannot dampen they cannot dampen
V-ing form
I cannot be dampening you cannot be dampening he cannot be dampening we cannot be dampening you cannot be dampening they cannot be dampening
Perfect
I cannot have dampened you cannot have dampened he cannot have dampened we cannot have dampened you cannot have dampened they cannot have dampened
V-ing perfect
I cannot have been dampening you cannot have been dampening he cannot have been dampening we cannot have been dampening you cannot have been dampening they cannot have been dampening
Interrogative form
Simple form
can I dampen? can you dampen? can he dampen? can we dampen? can you dampen? can they dampen?
V-ing form
can I be dampening? can you be dampening? can he be dampening? can we be dampening? can you be dampening? can they be dampening?
Perfect
can I have dampened? can you have dampened? can he have dampened? can we have dampened? can you have dampened? can they have dampened?
V-ing perfect
can I have been dampening? can you have been dampening? can he have been dampening? can we have been dampening? can you have been dampening? can they have been dampening?
Interro-negative form
Simple form
can I not dampen? can you not dampen? can he not dampen? can we not dampen? can you not dampen? can they not dampen?
V-ing form
can I not be dampening? can you not be dampening? can he not be dampening? can we not be dampening? can you not be dampening? can they not be dampening?
Perfect
can I not have dampened? can you not have dampened? can he not have dampened? can we not have dampened? can you not have dampened? can they not have dampened?
V-ing perfect
can I not have been dampening? can you not have been dampening? can he not have been dampening? can we not have been dampening? can you not have been dampening? can they not have been dampening?