English verb conjugation
MUST CREAK

Regular verb: creak - creaked - creaked

Affirmation

Simple form	V-ing form
I must creak you must creak he must creak we must creak you must creak they must creak	I must be creaking you must be creaking he must be creaking we must be creaking you must be creaking they must be creaking
Perfect	V-ing perfect
I must have creaked you must have creaked he must have creaked we must have creaked you must have creaked they must have creaked	I must have been creaking you must have been creaking he must have been creaking we must have been creaking you must have been creaking they must have been creaking

Negation

Simple form	V-ing form
I must not creak you must not creak he must not creak we must not creak you must not creak they must not creak	I must not be creaking you must not be creaking he must not be creaking we must not be creaking you must not be creaking they must not be creaking
Perfect	V-ing perfect
I must not have creaked you must not have creaked he must not have creaked we must not have creaked you must not have creaked they must not have creaked	I must not have been creaking you must not have been creaking he must not have been creaking we must not have been creaking you must not have been creaking they must not have been creaking

Interrogative form

Simple form	V-ing form
must I creak? must you creak? must he creak? must we creak? must you creak? must they creak?	must I be creaking? must you be creaking? must he be creaking? must we be creaking? must you be creaking? must they be creaking?
Perfect	V-ing perfect
must I have creaked? must you have creaked? must he have creaked? must we have creaked? must you have creaked? must they have creaked?	must I have been creaking? must you have been creaking? must he have been creaking? must we have been creaking? must you have been creaking? must they have been creaking?

Interro-negative form

Simple form	V-ing form
must I not creak? must you not creak? must he not creak? must we not creak? must you not creak? must they not creak?	must I not be creaking? must you not be creaking? must he not be creaking? must we not be creaking? must you not be creaking? must they not be creaking?
Perfect	V-ing perfect
must I not have creaked? must you not have creaked? must he not have creaked? must we not have creaked? must you not have creaked? must they not have creaked?	must I not have been creaking? must you not have been creaking? must he not have been creaking? must we not have been creaking? must you not have been creaking? must they not have been creaking?