I must flow you must flow she must flow we must flow you must flow they must flow
V-ing form
I must be flowing you must be flowing she must be flowing we must be flowing you must be flowing they must be flowing
Perfect
I must have flowed you must have flowed she must have flowed we must have flowed you must have flowed they must have flowed
V-ing perfect
I must have been flowing you must have been flowing she must have been flowing we must have been flowing you must have been flowing they must have been flowing
Negation
Simple form
I must not flow you must not flow she must not flow we must not flow you must not flow they must not flow
V-ing form
I must not be flowing you must not be flowing she must not be flowing we must not be flowing you must not be flowing they must not be flowing
Perfect
I must not have flowed you must not have flowed she must not have flowed we must not have flowed you must not have flowed they must not have flowed
V-ing perfect
I must not have been flowing you must not have been flowing she must not have been flowing we must not have been flowing you must not have been flowing they must not have been flowing
Interrogative form
Simple form
must I flow? must you flow? must she flow? must we flow? must you flow? must they flow?
V-ing form
must I be flowing? must you be flowing? must she be flowing? must we be flowing? must you be flowing? must they be flowing?
Perfect
must I have flowed? must you have flowed? must she have flowed? must we have flowed? must you have flowed? must they have flowed?
V-ing perfect
must I have been flowing? must you have been flowing? must she have been flowing? must we have been flowing? must you have been flowing? must they have been flowing?
Interro-negative form
Simple form
must I not flow? must you not flow? must she not flow? must we not flow? must you not flow? must they not flow?
V-ing form
must I not be flowing? must you not be flowing? must she not be flowing? must we not be flowing? must you not be flowing? must they not be flowing?
Perfect
must I not have flowed? must you not have flowed? must she not have flowed? must we not have flowed? must you not have flowed? must they not have flowed?
V-ing perfect
must I not have been flowing? must you not have been flowing? must she not have been flowing? must we not have been flowing? must you not have been flowing? must they not have been flowing?