I can stamp you can stamp he can stamp we can stamp you can stamp they can stamp
V-ing form
I can be stamping you can be stamping he can be stamping we can be stamping you can be stamping they can be stamping
Perfect
I can have stamped you can have stamped he can have stamped we can have stamped you can have stamped they can have stamped
V-ing perfect
I can have been stamping you can have been stamping he can have been stamping we can have been stamping you can have been stamping they can have been stamping
Negation
Simple form
I can't stamp you can't stamp he can't stamp we can't stamp you can't stamp they can't stamp
V-ing form
I can't be stamping you can't be stamping he can't be stamping we can't be stamping you can't be stamping they can't be stamping
Perfect
I can't have stamped you can't have stamped he can't have stamped we can't have stamped you can't have stamped they can't have stamped
V-ing perfect
I can't have been stamping you can't have been stamping he can't have been stamping we can't have been stamping you can't have been stamping they can't have been stamping
Interrogative form
Simple form
can I stamp? can you stamp? can he stamp? can we stamp? can you stamp? can they stamp?
V-ing form
can I be stamping? can you be stamping? can he be stamping? can we be stamping? can you be stamping? can they be stamping?
Perfect
can I have stamped? can you have stamped? can he have stamped? can we have stamped? can you have stamped? can they have stamped?
V-ing perfect
can I have been stamping? can you have been stamping? can he have been stamping? can we have been stamping? can you have been stamping? can they have been stamping?
Interro-negative form
Simple form
can't I stamp? can't you stamp? can't he stamp? can't we stamp? can't you stamp? can't they stamp?
V-ing form
can't I be stamping? can't you be stamping? can't he be stamping? can't we be stamping? can't you be stamping? can't they be stamping?
Perfect
can't I have stamped? can't you have stamped? can't he have stamped? can't we have stamped? can't you have stamped? can't they have stamped?
V-ing perfect
can't I have been stamping? can't you have been stamping? can't he have been stamping? can't we have been stamping? can't you have been stamping? can't they have been stamping?