English verb conjugation
CAN BUCKLE

Regular verb: buckle - buckled - buckled

Affirmation

Simple form	V-ing form
I can buckle you can buckle he can buckle we can buckle you can buckle they can buckle	I can be buckling you can be buckling he 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 he 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 he 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 he 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 he 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 he 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 he 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 he buckle? can we buckle? can you buckle? can they buckle?	can I be buckling? can you be buckling? can he 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 he 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 he 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 he 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 he 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 he 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 he have been buckling? can't we have been buckling? can't you have been buckling? can't they have been buckling?