English verb conjugation
MUST QUAIL

Regular verb: quail - quailed - quailed

Affirmation

Simple form	V-ing form
I must quail you must quail he must quail we must quail you must quail they must quail	I must be quailing you must be quailing he must be quailing we must be quailing you must be quailing they must be quailing
Perfect	V-ing perfect
I must have quailed you must have quailed he must have quailed we must have quailed you must have quailed they must have quailed	I must have been quailing you must have been quailing he must have been quailing we must have been quailing you must have been quailing they must have been quailing

Negation

Simple form	V-ing form
I must not quail you must not quail he must not quail we must not quail you must not quail they must not quail	I must not be quailing you must not be quailing he must not be quailing we must not be quailing you must not be quailing they must not be quailing
Perfect	V-ing perfect
I must not have quailed you must not have quailed he must not have quailed we must not have quailed you must not have quailed they must not have quailed	I must not have been quailing you must not have been quailing he must not have been quailing we must not have been quailing you must not have been quailing they must not have been quailing

Interrogative form

Simple form	V-ing form
must I quail? must you quail? must he quail? must we quail? must you quail? must they quail?	must I be quailing? must you be quailing? must he be quailing? must we be quailing? must you be quailing? must they be quailing?
Perfect	V-ing perfect
must I have quailed? must you have quailed? must he have quailed? must we have quailed? must you have quailed? must they have quailed?	must I have been quailing? must you have been quailing? must he have been quailing? must we have been quailing? must you have been quailing? must they have been quailing?

Interro-negative form

Simple form	V-ing form
must I not quail? must you not quail? must he not quail? must we not quail? must you not quail? must they not quail?	must I not be quailing? must you not be quailing? must he not be quailing? must we not be quailing? must you not be quailing? must they not be quailing?
Perfect	V-ing perfect
must I not have quailed? must you not have quailed? must he not have quailed? must we not have quailed? must you not have quailed? must they not have quailed?	must I not have been quailing? must you not have been quailing? must he not have been quailing? must we not have been quailing? must you not have been quailing? must they not have been quailing?