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 mustn't skirl you mustn't skirl he mustn't skirl we mustn't skirl you mustn't skirl they mustn't skirl	I mustn't be skirling you mustn't be skirling he mustn't be skirling we mustn't be skirling you mustn't be skirling they mustn't be skirling
Perfect	V-ing perfect
I mustn't have skirled you mustn't have skirled he mustn't have skirled we mustn't have skirled you mustn't have skirled they mustn't have skirled	I mustn't have been skirling you mustn't have been skirling he mustn't have been skirling we mustn't have been skirling you mustn't have been skirling they mustn't 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
mustn't I skirl? mustn't you skirl? mustn't he skirl? mustn't we skirl? mustn't you skirl? mustn't they skirl?	mustn't I be skirling? mustn't you be skirling? mustn't he be skirling? mustn't we be skirling? mustn't you be skirling? mustn't they be skirling?
Perfect	V-ing perfect
mustn't I have skirled? mustn't you have skirled? mustn't he have skirled? mustn't we have skirled? mustn't you have skirled? mustn't they have skirled?	mustn't I have been skirling? mustn't you have been skirling? mustn't he have been skirling? mustn't we have been skirling? mustn't you have been skirling? mustn't they have been skirling?