English verb conjugation
CAN UNFASTEN

Regular verb: unfasten - unfastened - unfastened

Affirmation

Simple form	V-ing form
I can unfasten you can unfasten he can unfasten we can unfasten you can unfasten they can unfasten	I can be unfastening you can be unfastening he can be unfastening we can be unfastening you can be unfastening they can be unfastening
Perfect	V-ing perfect
I can have unfastened you can have unfastened he can have unfastened we can have unfastened you can have unfastened they can have unfastened	I can have been unfastening you can have been unfastening he can have been unfastening we can have been unfastening you can have been unfastening they can have been unfastening

Negation

Simple form	V-ing form
I cannot unfasten you cannot unfasten he cannot unfasten we cannot unfasten you cannot unfasten they cannot unfasten	I cannot be unfastening you cannot be unfastening he cannot be unfastening we cannot be unfastening you cannot be unfastening they cannot be unfastening
Perfect	V-ing perfect
I cannot have unfastened you cannot have unfastened he cannot have unfastened we cannot have unfastened you cannot have unfastened they cannot have unfastened	I cannot have been unfastening you cannot have been unfastening he cannot have been unfastening we cannot have been unfastening you cannot have been unfastening they cannot have been unfastening

Interrogative form

Simple form	V-ing form
can I unfasten? can you unfasten? can he unfasten? can we unfasten? can you unfasten? can they unfasten?	can I be unfastening? can you be unfastening? can he be unfastening? can we be unfastening? can you be unfastening? can they be unfastening?
Perfect	V-ing perfect
can I have unfastened? can you have unfastened? can he have unfastened? can we have unfastened? can you have unfastened? can they have unfastened?	can I have been unfastening? can you have been unfastening? can he have been unfastening? can we have been unfastening? can you have been unfastening? can they have been unfastening?

Interro-negative form

Simple form	V-ing form
can I not unfasten? can you not unfasten? can he not unfasten? can we not unfasten? can you not unfasten? can they not unfasten?	can I not be unfastening? can you not be unfastening? can he not be unfastening? can we not be unfastening? can you not be unfastening? can they not be unfastening?
Perfect	V-ing perfect
can I not have unfastened? can you not have unfastened? can he not have unfastened? can we not have unfastened? can you not have unfastened? can they not have unfastened?	can I not have been unfastening? can you not have been unfastening? can he not have been unfastening? can we not have been unfastening? can you not have been unfastening? can they not have been unfastening?