English verb conjugation
MUST SKIRL

Regular verb: skirl - skirled - skirled

Affirmation

Simple form	V-ing form
I must skirl you must skirl he must skirl we must skirl you must skirl they must skirl	I must be skirling you must be skirling he must be skirling we must be skirling you must be skirling they must be skirling
Perfect	V-ing perfect
I must have skirled you must have skirled he must have skirled we must have skirled you must have skirled they must have skirled	I must have been skirling you must have been skirling he must have been skirling we must have been skirling you must have been skirling they must have been skirling

Negation

Simple form	V-ing form
I must not skirl you must not skirl he must not skirl we must not skirl you must not skirl they must not skirl	I must not be skirling you must not be skirling he must not be skirling we must not be skirling you must not be skirling they must not be skirling
Perfect	V-ing perfect
I must not have skirled you must not have skirled he must not have skirled we must not have skirled you must not have skirled they must not have skirled	I must not have been skirling you must not have been skirling he must not have been skirling we must not have been skirling you must not have been skirling they must not have been skirling

Interrogative form

Simple form	V-ing form
must I skirl? must you skirl? must he skirl? must we skirl? must you skirl? must they skirl?	must I be skirling? must you be skirling? must he be skirling? must we be skirling? must you be skirling? must they be skirling?
Perfect	V-ing perfect
must I have skirled? must you have skirled? must he have skirled? must we have skirled? must you have skirled? must they have skirled?	must I have been skirling? must you have been skirling? must he have been skirling? must we have been skirling? must you have been skirling? must they have been skirling?

Interro-negative form

Simple form	V-ing form
must I not skirl? must you not skirl? must he not skirl? must we not skirl? must you not skirl? must they not skirl?	must I not be skirling? must you not be skirling? must he not be skirling? must we not be skirling? must you not be skirling? must they not be skirling?
Perfect	V-ing perfect
must I not have skirled? must you not have skirled? must he not have skirled? must we not have skirled? must you not have skirled? must they not have skirled?	must I not have been skirling? must you not have been skirling? must he not have been skirling? must we not have been skirling? must you not have been skirling? must they not have been skirling?