I can staple you can staple she can staple we can staple you can staple they can staple
V-ing form
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
I can have stapled you can have stapled she can have stapled we can have stapled you can have stapled they can have stapled
V-ing perfect
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
I can't staple you can't staple she can't staple we can't staple you can't staple they can't staple
V-ing form
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
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
V-ing perfect
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
can I staple? can you staple? can she staple? can we staple? can you staple? can they staple?
V-ing form
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
can I have stapled? can you have stapled? can she have stapled? can we have stapled? can you have stapled? can they have stapled?
V-ing perfect
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
can't I staple? can't you staple? can't she staple? can't we staple? can't you staple? can't they staple?
V-ing form
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
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?
V-ing perfect
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?