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