I must counterbalance you must counterbalance she must counterbalance we must counterbalance you must counterbalance they must counterbalance
V-ing form
I must be counterbalancing you must be counterbalancing she must be counterbalancing we must be counterbalancing you must be counterbalancing they must be counterbalancing
Perfect
I must have counterbalanced you must have counterbalanced she must have counterbalanced we must have counterbalanced you must have counterbalanced they must have counterbalanced
V-ing perfect
I must have been counterbalancing you must have been counterbalancing she must have been counterbalancing we must have been counterbalancing you must have been counterbalancing they must have been counterbalancing
Negation
Simple form
I must not counterbalance you must not counterbalance she must not counterbalance we must not counterbalance you must not counterbalance they must not counterbalance
V-ing form
I must not be counterbalancing you must not be counterbalancing she must not be counterbalancing we must not be counterbalancing you must not be counterbalancing they must not be counterbalancing
Perfect
I must not have counterbalanced you must not have counterbalanced she must not have counterbalanced we must not have counterbalanced you must not have counterbalanced they must not have counterbalanced
V-ing perfect
I must not have been counterbalancing you must not have been counterbalancing she must not have been counterbalancing we must not have been counterbalancing you must not have been counterbalancing they must not have been counterbalancing
Interrogative form
Simple form
must I counterbalance? must you counterbalance? must she counterbalance? must we counterbalance? must you counterbalance? must they counterbalance?
V-ing form
must I be counterbalancing? must you be counterbalancing? must she be counterbalancing? must we be counterbalancing? must you be counterbalancing? must they be counterbalancing?
Perfect
must I have counterbalanced? must you have counterbalanced? must she have counterbalanced? must we have counterbalanced? must you have counterbalanced? must they have counterbalanced?
V-ing perfect
must I have been counterbalancing? must you have been counterbalancing? must she have been counterbalancing? must we have been counterbalancing? must you have been counterbalancing? must they have been counterbalancing?
Interro-negative form
Simple form
must I not counterbalance? must you not counterbalance? must she not counterbalance? must we not counterbalance? must you not counterbalance? must they not counterbalance?
V-ing form
must I not be counterbalancing? must you not be counterbalancing? must she not be counterbalancing? must we not be counterbalancing? must you not be counterbalancing? must they not be counterbalancing?
Perfect
must I not have counterbalanced? must you not have counterbalanced? must she not have counterbalanced? must we not have counterbalanced? must you not have counterbalanced? must they not have counterbalanced?
V-ing perfect
must I not have been counterbalancing? must you not have been counterbalancing? must she not have been counterbalancing? must we not have been counterbalancing? must you not have been counterbalancing? must they not have been counterbalancing?