I can shred you can shred he can shred we can shred you can shred they can shred
V-ing form
I can be shredding you can be shredding he can be shredding we can be shredding you can be shredding they can be shredding
Perfect
I can have shredded you can have shredded he can have shredded we can have shredded you can have shredded they can have shredded
V-ing perfect
I can have been shredding you can have been shredding he can have been shredding we can have been shredding you can have been shredding they can have been shredding
Negation
Simple form
I can't shred you can't shred he can't shred we can't shred you can't shred they can't shred
V-ing form
I can't be shredding you can't be shredding he can't be shredding we can't be shredding you can't be shredding they can't be shredding
Perfect
I can't have shredded you can't have shredded he can't have shredded we can't have shredded you can't have shredded they can't have shredded
V-ing perfect
I can't have been shredding you can't have been shredding he can't have been shredding we can't have been shredding you can't have been shredding they can't have been shredding
Interrogative form
Simple form
can I shred? can you shred? can he shred? can we shred? can you shred? can they shred?
V-ing form
can I be shredding? can you be shredding? can he be shredding? can we be shredding? can you be shredding? can they be shredding?
Perfect
can I have shredded? can you have shredded? can he have shredded? can we have shredded? can you have shredded? can they have shredded?
V-ing perfect
can I have been shredding? can you have been shredding? can he have been shredding? can we have been shredding? can you have been shredding? can they have been shredding?
Interro-negative form
Simple form
can't I shred? can't you shred? can't he shred? can't we shred? can't you shred? can't they shred?
V-ing form
can't I be shredding? can't you be shredding? can't he be shredding? can't we be shredding? can't you be shredding? can't they be shredding?
Perfect
can't I have shredded? can't you have shredded? can't he have shredded? can't we have shredded? can't you have shredded? can't they have shredded?
V-ing perfect
can't I have been shredding? can't you have been shredding? can't he have been shredding? can't we have been shredding? can't you have been shredding? can't they have been shredding?