English verb conjugation
MUST CORKSCREW

Regular verb: corkscrew - corkscrewed - corkscrewed

Affirmation

Simple form	V-ing form
I must corkscrew you must corkscrew she must corkscrew we must corkscrew you must corkscrew they must corkscrew	I must be corkscrewing you must be corkscrewing she must be corkscrewing we must be corkscrewing you must be corkscrewing they must be corkscrewing
Perfect	V-ing perfect
I must have corkscrewed you must have corkscrewed she must have corkscrewed we must have corkscrewed you must have corkscrewed they must have corkscrewed	I must have been corkscrewing you must have been corkscrewing she must have been corkscrewing we must have been corkscrewing you must have been corkscrewing they must have been corkscrewing

Negation

Simple form	V-ing form
I must not corkscrew you must not corkscrew she must not corkscrew we must not corkscrew you must not corkscrew they must not corkscrew	I must not be corkscrewing you must not be corkscrewing she must not be corkscrewing we must not be corkscrewing you must not be corkscrewing they must not be corkscrewing
Perfect	V-ing perfect
I must not have corkscrewed you must not have corkscrewed she must not have corkscrewed we must not have corkscrewed you must not have corkscrewed they must not have corkscrewed	I must not have been corkscrewing you must not have been corkscrewing she must not have been corkscrewing we must not have been corkscrewing you must not have been corkscrewing they must not have been corkscrewing

Interrogative form

Simple form	V-ing form
must I corkscrew? must you corkscrew? must she corkscrew? must we corkscrew? must you corkscrew? must they corkscrew?	must I be corkscrewing? must you be corkscrewing? must she be corkscrewing? must we be corkscrewing? must you be corkscrewing? must they be corkscrewing?
Perfect	V-ing perfect
must I have corkscrewed? must you have corkscrewed? must she have corkscrewed? must we have corkscrewed? must you have corkscrewed? must they have corkscrewed?	must I have been corkscrewing? must you have been corkscrewing? must she have been corkscrewing? must we have been corkscrewing? must you have been corkscrewing? must they have been corkscrewing?

Interro-negative form

Simple form	V-ing form
must I not corkscrew? must you not corkscrew? must she not corkscrew? must we not corkscrew? must you not corkscrew? must they not corkscrew?	must I not be corkscrewing? must you not be corkscrewing? must she not be corkscrewing? must we not be corkscrewing? must you not be corkscrewing? must they not be corkscrewing?
Perfect	V-ing perfect
must I not have corkscrewed? must you not have corkscrewed? must she not have corkscrewed? must we not have corkscrewed? must you not have corkscrewed? must they not have corkscrewed?	must I not have been corkscrewing? must you not have been corkscrewing? must she not have been corkscrewing? must we not have been corkscrewing? must you not have been corkscrewing? must they not have been corkscrewing?