English verb conjugation
SHOULD BUCKLE

Regular verb: buckle - buckled - buckled

Affirmation

Simple form	V-ing form
I'd buckle you'd buckle he'd buckle we'd buckle you'd buckle they'd buckle	I'd be buckling you'd be buckling he'd be buckling we'd be buckling you'd be buckling they'd be buckling
Perfect	V-ing perfect
I should've buckled you should've buckled he should've buckled we should've buckled you should've buckled they should've buckled	I should've been buckling you should've been buckling he should've been buckling we should've been buckling you should've been buckling they should've been buckling

Negation

Simple form	V-ing form
I shouldn't buckle you shouldn't buckle he shouldn't buckle we shouldn't buckle you shouldn't buckle they shouldn't buckle	I shouldn't be buckling you shouldn't be buckling he shouldn't be buckling we shouldn't be buckling you shouldn't be buckling they shouldn't be buckling
Perfect	V-ing perfect
I shouldn't have buckled you shouldn't have buckled he shouldn't have buckled we shouldn't have buckled you shouldn't have buckled they shouldn't have buckled	I shouldn't have been buckling you shouldn't have been buckling he shouldn't have been buckling we shouldn't have been buckling you shouldn't have been buckling they shouldn't have been buckling

Interrogative form

Simple form	V-ing form
should I buckle? should you buckle? should he buckle? should we buckle? should you buckle? should they buckle?	should I be buckling? should you be buckling? should he be buckling? should we be buckling? should you be buckling? should they be buckling?
Perfect	V-ing perfect
should I have buckled? should you have buckled? should he have buckled? should we have buckled? should you have buckled? should they have buckled?	should I have been buckling? should you have been buckling? should he have been buckling? should we have been buckling? should you have been buckling? should they have been buckling?

Interro-negative form

Simple form	V-ing form
shouldn't I buckle? shouldn't you buckle? shouldn't he buckle? shouldn't we buckle? shouldn't you buckle? shouldn't they buckle?	shouldn't I be buckling? shouldn't you be buckling? shouldn't he be buckling? shouldn't we be buckling? shouldn't you be buckling? shouldn't they be buckling?
Perfect	V-ing perfect
shouldn't I have buckled? shouldn't you have buckled? shouldn't he have buckled? shouldn't we have buckled? shouldn't you have buckled? shouldn't they have buckled?	shouldn't I have been buckling? shouldn't you have been buckling? shouldn't he have been buckling? shouldn't we have been buckling? shouldn't you have been buckling? shouldn't they have been buckling?