I can crop you can crop he can crop we can crop you can crop they can crop
V-ing form
I can be cropping you can be cropping he can be cropping we can be cropping you can be cropping they can be cropping
Perfect
I can have cropped you can have cropped he can have cropped we can have cropped you can have cropped they can have cropped
V-ing perfect
I can have been cropping you can have been cropping he can have been cropping we can have been cropping you can have been cropping they can have been cropping
Negation
Simple form
I cannot crop you cannot crop he cannot crop we cannot crop you cannot crop they cannot crop
V-ing form
I cannot be cropping you cannot be cropping he cannot be cropping we cannot be cropping you cannot be cropping they cannot be cropping
Perfect
I cannot have cropped you cannot have cropped he cannot have cropped we cannot have cropped you cannot have cropped they cannot have cropped
V-ing perfect
I cannot have been cropping you cannot have been cropping he cannot have been cropping we cannot have been cropping you cannot have been cropping they cannot have been cropping
Interrogative form
Simple form
can I crop? can you crop? can he crop? can we crop? can you crop? can they crop?
V-ing form
can I be cropping? can you be cropping? can he be cropping? can we be cropping? can you be cropping? can they be cropping?
Perfect
can I have cropped? can you have cropped? can he have cropped? can we have cropped? can you have cropped? can they have cropped?
V-ing perfect
can I have been cropping? can you have been cropping? can he have been cropping? can we have been cropping? can you have been cropping? can they have been cropping?
Interro-negative form
Simple form
can I not crop? can you not crop? can he not crop? can we not crop? can you not crop? can they not crop?
V-ing form
can I not be cropping? can you not be cropping? can he not be cropping? can we not be cropping? can you not be cropping? can they not be cropping?
Perfect
can I not have cropped? can you not have cropped? can he not have cropped? can we not have cropped? can you not have cropped? can they not have cropped?
V-ing perfect
can I not have been cropping? can you not have been cropping? can he not have been cropping? can we not have been cropping? can you not have been cropping? can they not have been cropping?