English verb conjugation
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Regular verb: gap - gaped - gaped

Affirmation

Simple form	V-ing form
I must gap you must gap he must gap we must gap you must gap they must gap	I must be gaping you must be gaping he must be gaping we must be gaping you must be gaping they must be gaping
Perfect	V-ing perfect
I must have gaped you must have gaped he must have gaped we must have gaped you must have gaped they must have gaped	I must have been gaping you must have been gaping he must have been gaping we must have been gaping you must have been gaping they must have been gaping

Negation

Simple form	V-ing form
I must not gap you must not gap he must not gap we must not gap you must not gap they must not gap	I must not be gaping you must not be gaping he must not be gaping we must not be gaping you must not be gaping they must not be gaping
Perfect	V-ing perfect
I must not have gaped you must not have gaped he must not have gaped we must not have gaped you must not have gaped they must not have gaped	I must not have been gaping you must not have been gaping he must not have been gaping we must not have been gaping you must not have been gaping they must not have been gaping

Interrogative form

Simple form	V-ing form
must I gap? must you gap? must he gap? must we gap? must you gap? must they gap?	must I be gaping? must you be gaping? must he be gaping? must we be gaping? must you be gaping? must they be gaping?
Perfect	V-ing perfect
must I have gaped? must you have gaped? must he have gaped? must we have gaped? must you have gaped? must they have gaped?	must I have been gaping? must you have been gaping? must he have been gaping? must we have been gaping? must you have been gaping? must they have been gaping?

Interro-negative form

Simple form	V-ing form
must I not gap? must you not gap? must he not gap? must we not gap? must you not gap? must they not gap?	must I not be gaping? must you not be gaping? must he not be gaping? must we not be gaping? must you not be gaping? must they not be gaping?
Perfect	V-ing perfect
must I not have gaped? must you not have gaped? must he not have gaped? must we not have gaped? must you not have gaped? must they not have gaped?	must I not have been gaping? must you not have been gaping? must he not have been gaping? must we not have been gaping? must you not have been gaping? must they not have been gaping?