English verb conjugation
CAN STAPLE

Regular verb: staple - stapled - stapled

Affirmation

Simple form	V-ing form
I can staple you can staple she can staple we can staple you can staple they can staple	I can be stapling you can be stapling she can be stapling we can be stapling you can be stapling they can be stapling
Perfect	V-ing perfect
I can have stapled you can have stapled she can have stapled we can have stapled you can have stapled they can have stapled	I can have been stapling you can have been stapling she can have been stapling we can have been stapling you can have been stapling they can have been stapling

Negation

Simple form	V-ing form
I can't staple you can't staple she can't staple we can't staple you can't staple they can't staple	I can't be stapling you can't be stapling she can't be stapling we can't be stapling you can't be stapling they can't be stapling
Perfect	V-ing perfect
I can't have stapled you can't have stapled she can't have stapled we can't have stapled you can't have stapled they can't have stapled	I can't have been stapling you can't have been stapling she can't have been stapling we can't have been stapling you can't have been stapling they can't have been stapling

Interrogative form

Simple form	V-ing form
can I staple? can you staple? can she staple? can we staple? can you staple? can they staple?	can I be stapling? can you be stapling? can she be stapling? can we be stapling? can you be stapling? can they be stapling?
Perfect	V-ing perfect
can I have stapled? can you have stapled? can she have stapled? can we have stapled? can you have stapled? can they have stapled?	can I have been stapling? can you have been stapling? can she have been stapling? can we have been stapling? can you have been stapling? can they have been stapling?

Interro-negative form

Simple form	V-ing form
can't I staple? can't you staple? can't she staple? can't we staple? can't you staple? can't they staple?	can't I be stapling? can't you be stapling? can't she be stapling? can't we be stapling? can't you be stapling? can't they be stapling?
Perfect	V-ing perfect
can't I have stapled? can't you have stapled? can't she have stapled? can't we have stapled? can't you have stapled? can't they have stapled?	can't I have been stapling? can't you have been stapling? can't she have been stapling? can't we have been stapling? can't you have been stapling? can't they have been stapling?