I must confer you must confer she must confer we must confer you must confer they must confer
V-ing form
I must be conferring you must be conferring she must be conferring we must be conferring you must be conferring they must be conferring
Perfect
I must have conferred you must have conferred she must have conferred we must have conferred you must have conferred they must have conferred
V-ing perfect
I must have been conferring you must have been conferring she must have been conferring we must have been conferring you must have been conferring they must have been conferring
Negation
Simple form
I must not confer you must not confer she must not confer we must not confer you must not confer they must not confer
V-ing form
I must not be conferring you must not be conferring she must not be conferring we must not be conferring you must not be conferring they must not be conferring
Perfect
I must not have conferred you must not have conferred she must not have conferred we must not have conferred you must not have conferred they must not have conferred
V-ing perfect
I must not have been conferring you must not have been conferring she must not have been conferring we must not have been conferring you must not have been conferring they must not have been conferring
Interrogative form
Simple form
must I confer? must you confer? must she confer? must we confer? must you confer? must they confer?
V-ing form
must I be conferring? must you be conferring? must she be conferring? must we be conferring? must you be conferring? must they be conferring?
Perfect
must I have conferred? must you have conferred? must she have conferred? must we have conferred? must you have conferred? must they have conferred?
V-ing perfect
must I have been conferring? must you have been conferring? must she have been conferring? must we have been conferring? must you have been conferring? must they have been conferring?
Interro-negative form
Simple form
must I not confer? must you not confer? must she not confer? must we not confer? must you not confer? must they not confer?
V-ing form
must I not be conferring? must you not be conferring? must she not be conferring? must we not be conferring? must you not be conferring? must they not be conferring?
Perfect
must I not have conferred? must you not have conferred? must she not have conferred? must we not have conferred? must you not have conferred? must they not have conferred?
V-ing perfect
must I not have been conferring? must you not have been conferring? must she not have been conferring? must we not have been conferring? must you not have been conferring? must they not have been conferring?