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 cannot buckle you cannot buckle she cannot buckle we cannot buckle you cannot buckle they cannot buckle	I cannot be buckling you cannot be buckling she cannot be buckling we cannot be buckling you cannot be buckling they cannot be buckling
Perfect	V-ing perfect
I cannot have buckled you cannot have buckled she cannot have buckled we cannot have buckled you cannot have buckled they cannot have buckled	I cannot have been buckling you cannot have been buckling she cannot have been buckling we cannot have been buckling you cannot have been buckling they cannot 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 I not buckle? can you not buckle? can she not buckle? can we not buckle? can you not buckle? can they not buckle?	can I not be buckling? can you not be buckling? can she not be buckling? can we not be buckling? can you not be buckling? can they not be buckling?
Perfect	V-ing perfect
can I not have buckled? can you not have buckled? can she not have buckled? can we not have buckled? can you not have buckled? can they not have buckled?	can I not have been buckling? can you not have been buckling? can she not have been buckling? can we not have been buckling? can you not have been buckling? can they not have been buckling?