English verb conjugation
SHOULD WEAKEN

Regular verb: weaken - weakened - weakened

Affirmation

Simple form	V-ing form
I'd weaken you'd weaken he'd weaken we'd weaken you'd weaken they'd weaken	I'd be weakening you'd be weakening he'd be weakening we'd be weakening you'd be weakening they'd be weakening
Perfect	V-ing perfect
I should've weakened you should've weakened he should've weakened we should've weakened you should've weakened they should've weakened	I should've been weakening you should've been weakening he should've been weakening we should've been weakening you should've been weakening they should've been weakening

Negation

Simple form	V-ing form
I shouldn't weaken you shouldn't weaken he shouldn't weaken we shouldn't weaken you shouldn't weaken they shouldn't weaken	I shouldn't be weakening you shouldn't be weakening he shouldn't be weakening we shouldn't be weakening you shouldn't be weakening they shouldn't be weakening
Perfect	V-ing perfect
I shouldn't have weakened you shouldn't have weakened he shouldn't have weakened we shouldn't have weakened you shouldn't have weakened they shouldn't have weakened	I shouldn't have been weakening you shouldn't have been weakening he shouldn't have been weakening we shouldn't have been weakening you shouldn't have been weakening they shouldn't have been weakening

Interrogative form

Simple form	V-ing form
should I weaken? should you weaken? should he weaken? should we weaken? should you weaken? should they weaken?	should I be weakening? should you be weakening? should he be weakening? should we be weakening? should you be weakening? should they be weakening?
Perfect	V-ing perfect
should I have weakened? should you have weakened? should he have weakened? should we have weakened? should you have weakened? should they have weakened?	should I have been weakening? should you have been weakening? should he have been weakening? should we have been weakening? should you have been weakening? should they have been weakening?

Interro-negative form

Simple form	V-ing form
shouldn't I weaken? shouldn't you weaken? shouldn't he weaken? shouldn't we weaken? shouldn't you weaken? shouldn't they weaken?	shouldn't I be weakening? shouldn't you be weakening? shouldn't he be weakening? shouldn't we be weakening? shouldn't you be weakening? shouldn't they be weakening?
Perfect	V-ing perfect
shouldn't I have weakened? shouldn't you have weakened? shouldn't he have weakened? shouldn't we have weakened? shouldn't you have weakened? shouldn't they have weakened?	shouldn't I have been weakening? shouldn't you have been weakening? shouldn't he have been weakening? shouldn't we have been weakening? shouldn't you have been weakening? shouldn't they have been weakening?