I must decrepitate you must decrepitate she must decrepitate we must decrepitate you must decrepitate they must decrepitate
V-ing form
I must be decrepitating you must be decrepitating she must be decrepitating we must be decrepitating you must be decrepitating they must be decrepitating
Perfect
I must have decrepitated you must have decrepitated she must have decrepitated we must have decrepitated you must have decrepitated they must have decrepitated
V-ing perfect
I must have been decrepitating you must have been decrepitating she must have been decrepitating we must have been decrepitating you must have been decrepitating they must have been decrepitating
Negation
Simple form
I must not decrepitate you must not decrepitate she must not decrepitate we must not decrepitate you must not decrepitate they must not decrepitate
V-ing form
I must not be decrepitating you must not be decrepitating she must not be decrepitating we must not be decrepitating you must not be decrepitating they must not be decrepitating
Perfect
I must not have decrepitated you must not have decrepitated she must not have decrepitated we must not have decrepitated you must not have decrepitated they must not have decrepitated
V-ing perfect
I must not have been decrepitating you must not have been decrepitating she must not have been decrepitating we must not have been decrepitating you must not have been decrepitating they must not have been decrepitating
Interrogative form
Simple form
must I decrepitate? must you decrepitate? must she decrepitate? must we decrepitate? must you decrepitate? must they decrepitate?
V-ing form
must I be decrepitating? must you be decrepitating? must she be decrepitating? must we be decrepitating? must you be decrepitating? must they be decrepitating?
Perfect
must I have decrepitated? must you have decrepitated? must she have decrepitated? must we have decrepitated? must you have decrepitated? must they have decrepitated?
V-ing perfect
must I have been decrepitating? must you have been decrepitating? must she have been decrepitating? must we have been decrepitating? must you have been decrepitating? must they have been decrepitating?
Interro-negative form
Simple form
must I not decrepitate? must you not decrepitate? must she not decrepitate? must we not decrepitate? must you not decrepitate? must they not decrepitate?
V-ing form
must I not be decrepitating? must you not be decrepitating? must she not be decrepitating? must we not be decrepitating? must you not be decrepitating? must they not be decrepitating?
Perfect
must I not have decrepitated? must you not have decrepitated? must she not have decrepitated? must we not have decrepitated? must you not have decrepitated? must they not have decrepitated?
V-ing perfect
must I not have been decrepitating? must you not have been decrepitating? must she not have been decrepitating? must we not have been decrepitating? must you not have been decrepitating? must they not have been decrepitating?