English verb conjugation
CAN BUCKLE

Regular verb: buckle - buckled - buckled

Affirmation

Simple form	V-ing form
I can buckle you can buckle she can buckle we can buckle you can buckle they can buckle	I can be buckling you can be buckling she can be buckling we can be buckling you can be buckling they can be buckling
Perfect	V-ing perfect
I can have buckled you can have buckled she can have buckled we can have buckled you can have buckled they can have buckled	I can have been buckling you can have been buckling she can have been buckling we can have been buckling you can have been buckling they can have been buckling

Negation

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

Interrogative form

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

Interro-negative form

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