English verb conjugation
COULD RESTRENGTHEN

Regular verb: restrengthen - restrengthened - restrengthened

Affirmation

Simple form	V-ing form
I could restrengthen you could restrengthen she could restrengthen we could restrengthen you could restrengthen they could restrengthen	I could be restrengthening you could be restrengthening she 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 she 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 she 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 she 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 she 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 she 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 she 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 she restrengthen? could we restrengthen? could you restrengthen? could they restrengthen?	could I be restrengthening? could you be restrengthening? could she 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 she 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 she 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 she 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 she 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 she 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 she have been restrengthening? couldn't we have been restrengthening? couldn't you have been restrengthening? couldn't they have been restrengthening?