English verb conjugation
MUST SKIVVY

Regular verb: skivvy - skivvied - skivvied

Affirmation

Simple form	V-ing form
I must skivvy you must skivvy he must skivvy we must skivvy you must skivvy they must skivvy	I must be skivvying you must be skivvying he must be skivvying we must be skivvying you must be skivvying they must be skivvying
Perfect	V-ing perfect
I must have skivvied you must have skivvied he must have skivvied we must have skivvied you must have skivvied they must have skivvied	I must have been skivvying you must have been skivvying he must have been skivvying we must have been skivvying you must have been skivvying they must have been skivvying

Negation

Simple form	V-ing form
I mustn't skivvy you mustn't skivvy he mustn't skivvy we mustn't skivvy you mustn't skivvy they mustn't skivvy	I mustn't be skivvying you mustn't be skivvying he mustn't be skivvying we mustn't be skivvying you mustn't be skivvying they mustn't be skivvying
Perfect	V-ing perfect
I mustn't have skivvied you mustn't have skivvied he mustn't have skivvied we mustn't have skivvied you mustn't have skivvied they mustn't have skivvied	I mustn't have been skivvying you mustn't have been skivvying he mustn't have been skivvying we mustn't have been skivvying you mustn't have been skivvying they mustn't have been skivvying

Interrogative form

Simple form	V-ing form
must I skivvy? must you skivvy? must he skivvy? must we skivvy? must you skivvy? must they skivvy?	must I be skivvying? must you be skivvying? must he be skivvying? must we be skivvying? must you be skivvying? must they be skivvying?
Perfect	V-ing perfect
must I have skivvied? must you have skivvied? must he have skivvied? must we have skivvied? must you have skivvied? must they have skivvied?	must I have been skivvying? must you have been skivvying? must he have been skivvying? must we have been skivvying? must you have been skivvying? must they have been skivvying?

Interro-negative form

Simple form	V-ing form
mustn't I skivvy? mustn't you skivvy? mustn't he skivvy? mustn't we skivvy? mustn't you skivvy? mustn't they skivvy?	mustn't I be skivvying? mustn't you be skivvying? mustn't he be skivvying? mustn't we be skivvying? mustn't you be skivvying? mustn't they be skivvying?
Perfect	V-ing perfect
mustn't I have skivvied? mustn't you have skivvied? mustn't he have skivvied? mustn't we have skivvied? mustn't you have skivvied? mustn't they have skivvied?	mustn't I have been skivvying? mustn't you have been skivvying? mustn't he have been skivvying? mustn't we have been skivvying? mustn't you have been skivvying? mustn't they have been skivvying?