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 couldn't restrengthen you couldn't restrengthen he couldn't restrengthen we couldn't restrengthen you couldn't restrengthen they couldn't restrengthen	I couldn't be restrengthening you couldn't be restrengthening he couldn't be restrengthening we couldn't be restrengthening you couldn't be restrengthening they couldn't be restrengthening
Perfect	V-ing perfect
I couldn't have restrengthened you couldn't have restrengthened he couldn't have restrengthened we couldn't have restrengthened you couldn't have restrengthened they couldn't have restrengthened	I couldn't have been restrengthening you couldn't have been restrengthening he couldn't have been restrengthening we couldn't have been restrengthening you couldn't have been restrengthening they couldn't 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
couldn't I restrengthen? couldn't you restrengthen? couldn't he restrengthen? couldn't we restrengthen? couldn't you restrengthen? couldn't they restrengthen?	couldn't I be restrengthening? couldn't you be restrengthening? couldn't he be restrengthening? couldn't we be restrengthening? couldn't you be restrengthening? couldn't they be restrengthening?
Perfect	V-ing perfect
couldn't I have restrengthened? couldn't you have restrengthened? couldn't he have restrengthened? couldn't we have restrengthened? couldn't you have restrengthened? couldn't they have restrengthened?	couldn't I have been restrengthening? couldn't you have been restrengthening? couldn't he have been restrengthening? couldn't we have been restrengthening? couldn't you have been restrengthening? couldn't they have been restrengthening?