I must vacillate you must vacillate she must vacillate we must vacillate you must vacillate they must vacillate
V-ing form
I must be vacillating you must be vacillating she must be vacillating we must be vacillating you must be vacillating they must be vacillating
Perfect
I must have vacillated you must have vacillated she must have vacillated we must have vacillated you must have vacillated they must have vacillated
V-ing perfect
I must have been vacillating you must have been vacillating she must have been vacillating we must have been vacillating you must have been vacillating they must have been vacillating
Negation
Simple form
I must not vacillate you must not vacillate she must not vacillate we must not vacillate you must not vacillate they must not vacillate
V-ing form
I must not be vacillating you must not be vacillating she must not be vacillating we must not be vacillating you must not be vacillating they must not be vacillating
Perfect
I must not have vacillated you must not have vacillated she must not have vacillated we must not have vacillated you must not have vacillated they must not have vacillated
V-ing perfect
I must not have been vacillating you must not have been vacillating she must not have been vacillating we must not have been vacillating you must not have been vacillating they must not have been vacillating
Interrogative form
Simple form
must I vacillate? must you vacillate? must she vacillate? must we vacillate? must you vacillate? must they vacillate?
V-ing form
must I be vacillating? must you be vacillating? must she be vacillating? must we be vacillating? must you be vacillating? must they be vacillating?
Perfect
must I have vacillated? must you have vacillated? must she have vacillated? must we have vacillated? must you have vacillated? must they have vacillated?
V-ing perfect
must I have been vacillating? must you have been vacillating? must she have been vacillating? must we have been vacillating? must you have been vacillating? must they have been vacillating?
Interro-negative form
Simple form
must I not vacillate? must you not vacillate? must she not vacillate? must we not vacillate? must you not vacillate? must they not vacillate?
V-ing form
must I not be vacillating? must you not be vacillating? must she not be vacillating? must we not be vacillating? must you not be vacillating? must they not be vacillating?
Perfect
must I not have vacillated? must you not have vacillated? must she not have vacillated? must we not have vacillated? must you not have vacillated? must they not have vacillated?
V-ing perfect
must I not have been vacillating? must you not have been vacillating? must she not have been vacillating? must we not have been vacillating? must you not have been vacillating? must they not have been vacillating?