I can restrengthen you can restrengthen he can restrengthen we can restrengthen you can restrengthen they can restrengthen
V-ing form
I can be restrengthening you can be restrengthening he can be restrengthening we can be restrengthening you can be restrengthening they can be restrengthening
Perfect
I can have restrengthened you can have restrengthened he can have restrengthened we can have restrengthened you can have restrengthened they can have restrengthened
V-ing perfect
I can have been restrengthening you can have been restrengthening he can have been restrengthening we can have been restrengthening you can have been restrengthening they can have been restrengthening
Negation
Simple form
I cannot restrengthen you cannot restrengthen he cannot restrengthen we cannot restrengthen you cannot restrengthen they cannot restrengthen
V-ing form
I cannot be restrengthening you cannot be restrengthening he cannot be restrengthening we cannot be restrengthening you cannot be restrengthening they cannot be restrengthening
Perfect
I cannot have restrengthened you cannot have restrengthened he cannot have restrengthened we cannot have restrengthened you cannot have restrengthened they cannot have restrengthened
V-ing perfect
I cannot have been restrengthening you cannot have been restrengthening he cannot have been restrengthening we cannot have been restrengthening you cannot have been restrengthening they cannot have been restrengthening
Interrogative form
Simple form
can I restrengthen? can you restrengthen? can he restrengthen? can we restrengthen? can you restrengthen? can they restrengthen?
V-ing form
can I be restrengthening? can you be restrengthening? can he be restrengthening? can we be restrengthening? can you be restrengthening? can they be restrengthening?
Perfect
can I have restrengthened? can you have restrengthened? can he have restrengthened? can we have restrengthened? can you have restrengthened? can they have restrengthened?
V-ing perfect
can I have been restrengthening? can you have been restrengthening? can he have been restrengthening? can we have been restrengthening? can you have been restrengthening? can they have been restrengthening?
Interro-negative form
Simple form
can I not restrengthen? can you not restrengthen? can he not restrengthen? can we not restrengthen? can you not restrengthen? can they not restrengthen?
V-ing form
can I not be restrengthening? can you not be restrengthening? can he not be restrengthening? can we not be restrengthening? can you not be restrengthening? can they not be restrengthening?
Perfect
can I not have restrengthened? can you not have restrengthened? can he not have restrengthened? can we not have restrengthened? can you not have restrengthened? can they not have restrengthened?
V-ing perfect
can I not have been restrengthening? can you not have been restrengthening? can he not have been restrengthening? can we not have been restrengthening? can you not have been restrengthening? can they not have been restrengthening?