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