I must fear you must fear he must fear we must fear you must fear they must fear
V-ing form
I must be fearing you must be fearing he must be fearing we must be fearing you must be fearing they must be fearing
Perfect
I must have feared you must have feared he must have feared we must have feared you must have feared they must have feared
V-ing perfect
I must have been fearing you must have been fearing he must have been fearing we must have been fearing you must have been fearing they must have been fearing
Negation
Simple form
I must not fear you must not fear he must not fear we must not fear you must not fear they must not fear
V-ing form
I must not be fearing you must not be fearing he must not be fearing we must not be fearing you must not be fearing they must not be fearing
Perfect
I must not have feared you must not have feared he must not have feared we must not have feared you must not have feared they must not have feared
V-ing perfect
I must not have been fearing you must not have been fearing he must not have been fearing we must not have been fearing you must not have been fearing they must not have been fearing
Interrogative form
Simple form
must I fear? must you fear? must he fear? must we fear? must you fear? must they fear?
V-ing form
must I be fearing? must you be fearing? must he be fearing? must we be fearing? must you be fearing? must they be fearing?
Perfect
must I have feared? must you have feared? must he have feared? must we have feared? must you have feared? must they have feared?
V-ing perfect
must I have been fearing? must you have been fearing? must he have been fearing? must we have been fearing? must you have been fearing? must they have been fearing?
Interro-negative form
Simple form
must I not fear? must you not fear? must he not fear? must we not fear? must you not fear? must they not fear?
V-ing form
must I not be fearing? must you not be fearing? must he not be fearing? must we not be fearing? must you not be fearing? must they not be fearing?
Perfect
must I not have feared? must you not have feared? must he not have feared? must we not have feared? must you not have feared? must they not have feared?
V-ing perfect
must I not have been fearing? must you not have been fearing? must he not have been fearing? must we not have been fearing? must you not have been fearing? must they not have been fearing?