I must fence you must fence he must fence we must fence you must fence they must fence
V-ing form
I must be fencing you must be fencing he must be fencing we must be fencing you must be fencing they must be fencing
Perfect
I must have fenced you must have fenced he must have fenced we must have fenced you must have fenced they must have fenced
V-ing perfect
I must have been fencing you must have been fencing he must have been fencing we must have been fencing you must have been fencing they must have been fencing
Negation
Simple form
I must not fence you must not fence he must not fence we must not fence you must not fence they must not fence
V-ing form
I must not be fencing you must not be fencing he must not be fencing we must not be fencing you must not be fencing they must not be fencing
Perfect
I must not have fenced you must not have fenced he must not have fenced we must not have fenced you must not have fenced they must not have fenced
V-ing perfect
I must not have been fencing you must not have been fencing he must not have been fencing we must not have been fencing you must not have been fencing they must not have been fencing
Interrogative form
Simple form
must I fence? must you fence? must he fence? must we fence? must you fence? must they fence?
V-ing form
must I be fencing? must you be fencing? must he be fencing? must we be fencing? must you be fencing? must they be fencing?
Perfect
must I have fenced? must you have fenced? must he have fenced? must we have fenced? must you have fenced? must they have fenced?
V-ing perfect
must I have been fencing? must you have been fencing? must he have been fencing? must we have been fencing? must you have been fencing? must they have been fencing?
Interro-negative form
Simple form
must I not fence? must you not fence? must he not fence? must we not fence? must you not fence? must they not fence?
V-ing form
must I not be fencing? must you not be fencing? must he not be fencing? must we not be fencing? must you not be fencing? must they not be fencing?
Perfect
must I not have fenced? must you not have fenced? must he not have fenced? must we not have fenced? must you not have fenced? must they not have fenced?
V-ing perfect
must I not have been fencing? must you not have been fencing? must he not have been fencing? must we not have been fencing? must you not have been fencing? must they not have been fencing?