English verb conjugation
COULD RESTRENGTHEN

Regular verb: restrengthen - restrengthened - restrengthened

Affirmation

Simple form	V-ing form
I could restrengthen you could restrengthen he could restrengthen we could restrengthen you could restrengthen they could restrengthen	I could be restrengthening you could be restrengthening he could be restrengthening we could be restrengthening you could be restrengthening they could be restrengthening
Perfect	V-ing perfect
I could have restrengthened you could have restrengthened he could have restrengthened we could have restrengthened you could have restrengthened they could have restrengthened	I could have been restrengthening you could have been restrengthening he could have been restrengthening we could have been restrengthening you could have been restrengthening they could have been restrengthening

Negation

Simple form	V-ing form
I could not restrengthen you could not restrengthen he could not restrengthen we could not restrengthen you could not restrengthen they could not restrengthen	I could not be restrengthening you could not be restrengthening he could not be restrengthening we could not be restrengthening you could not be restrengthening they could not be restrengthening
Perfect	V-ing perfect
I could not have restrengthened you could not have restrengthened he could not have restrengthened we could not have restrengthened you could not have restrengthened they could not have restrengthened	I could not have been restrengthening you could not have been restrengthening he could not have been restrengthening we could not have been restrengthening you could not have been restrengthening they could not have been restrengthening

Interrogative form

Simple form	V-ing form
could I restrengthen? could you restrengthen? could he restrengthen? could we restrengthen? could you restrengthen? could they restrengthen?	could I be restrengthening? could you be restrengthening? could he be restrengthening? could we be restrengthening? could you be restrengthening? could they be restrengthening?
Perfect	V-ing perfect
could I have restrengthened? could you have restrengthened? could he have restrengthened? could we have restrengthened? could you have restrengthened? could they have restrengthened?	could I have been restrengthening? could you have been restrengthening? could he have been restrengthening? could we have been restrengthening? could you have been restrengthening? could they have been restrengthening?

Interro-negative form

Simple form	V-ing form
could I not restrengthen? could you not restrengthen? could he not restrengthen? could we not restrengthen? could you not restrengthen? could they not restrengthen?	could I not be restrengthening? could you not be restrengthening? could he not be restrengthening? could we not be restrengthening? could you not be restrengthening? could they not be restrengthening?
Perfect	V-ing perfect
could I not have restrengthened? could you not have restrengthened? could he not have restrengthened? could we not have restrengthened? could you not have restrengthened? could they not have restrengthened?	could I not have been restrengthening? could you not have been restrengthening? could he not have been restrengthening? could we not have been restrengthening? could you not have been restrengthening? could they not have been restrengthening?