I can stock you can stock he can stock we can stock you can stock they can stock
V-ing form
I can be stocking you can be stocking he can be stocking we can be stocking you can be stocking they can be stocking
Perfect
I can have stocked you can have stocked he can have stocked we can have stocked you can have stocked they can have stocked
V-ing perfect
I can have been stocking you can have been stocking he can have been stocking we can have been stocking you can have been stocking they can have been stocking
Negation
Simple form
I can't stock you can't stock he can't stock we can't stock you can't stock they can't stock
V-ing form
I can't be stocking you can't be stocking he can't be stocking we can't be stocking you can't be stocking they can't be stocking
Perfect
I can't have stocked you can't have stocked he can't have stocked we can't have stocked you can't have stocked they can't have stocked
V-ing perfect
I can't have been stocking you can't have been stocking he can't have been stocking we can't have been stocking you can't have been stocking they can't have been stocking
Interrogative form
Simple form
can I stock? can you stock? can he stock? can we stock? can you stock? can they stock?
V-ing form
can I be stocking? can you be stocking? can he be stocking? can we be stocking? can you be stocking? can they be stocking?
Perfect
can I have stocked? can you have stocked? can he have stocked? can we have stocked? can you have stocked? can they have stocked?
V-ing perfect
can I have been stocking? can you have been stocking? can he have been stocking? can we have been stocking? can you have been stocking? can they have been stocking?
Interro-negative form
Simple form
can't I stock? can't you stock? can't he stock? can't we stock? can't you stock? can't they stock?
V-ing form
can't I be stocking? can't you be stocking? can't he be stocking? can't we be stocking? can't you be stocking? can't they be stocking?
Perfect
can't I have stocked? can't you have stocked? can't he have stocked? can't we have stocked? can't you have stocked? can't they have stocked?
V-ing perfect
can't I have been stocking? can't you have been stocking? can't he have been stocking? can't we have been stocking? can't you have been stocking? can't they have been stocking?