I must enter you must enter she must enter we must enter you must enter they must enter
V-ing form
I must be entering you must be entering she must be entering we must be entering you must be entering they must be entering
Perfect
I must have entered you must have entered she must have entered we must have entered you must have entered they must have entered
V-ing perfect
I must have been entering you must have been entering she must have been entering we must have been entering you must have been entering they must have been entering
Negation
Simple form
I must not enter you must not enter she must not enter we must not enter you must not enter they must not enter
V-ing form
I must not be entering you must not be entering she must not be entering we must not be entering you must not be entering they must not be entering
Perfect
I must not have entered you must not have entered she must not have entered we must not have entered you must not have entered they must not have entered
V-ing perfect
I must not have been entering you must not have been entering she must not have been entering we must not have been entering you must not have been entering they must not have been entering
Interrogative form
Simple form
must I enter? must you enter? must she enter? must we enter? must you enter? must they enter?
V-ing form
must I be entering? must you be entering? must she be entering? must we be entering? must you be entering? must they be entering?
Perfect
must I have entered? must you have entered? must she have entered? must we have entered? must you have entered? must they have entered?
V-ing perfect
must I have been entering? must you have been entering? must she have been entering? must we have been entering? must you have been entering? must they have been entering?
Interro-negative form
Simple form
must I not enter? must you not enter? must she not enter? must we not enter? must you not enter? must they not enter?
V-ing form
must I not be entering? must you not be entering? must she not be entering? must we not be entering? must you not be entering? must they not be entering?
Perfect
must I not have entered? must you not have entered? must she not have entered? must we not have entered? must you not have entered? must they not have entered?
V-ing perfect
must I not have been entering? must you not have been entering? must she not have been entering? must we not have been entering? must you not have been entering? must they not have been entering?