English verb conjugation
MUST SKIVVY

Regular verb: skivvy - skivvied - skivvied

Affirmation

Simple form	V-ing form
I must skivvy you must skivvy she must skivvy we must skivvy you must skivvy they must skivvy	I must be skivvying you must be skivvying she 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 she 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 she 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 she 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 she 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 she 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 she 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 she skivvy? must we skivvy? must you skivvy? must they skivvy?	must I be skivvying? must you be skivvying? must she 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 she 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 she 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 she 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 she 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 she 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 she have been skivvying? mustn't we have been skivvying? mustn't you have been skivvying? mustn't they have been skivvying?