English verb conjugation
MUST SKY

Regular verb: sky - skied - skied

Affirmation

Simple form	V-ing form
I must sky you must sky she must sky we must sky you must sky they must sky	I must be skying you must be skying she must be skying we must be skying you must be skying they must be skying
Perfect	V-ing perfect
I must have skied you must have skied she must have skied we must have skied you must have skied they must have skied	I must have been skying you must have been skying she must have been skying we must have been skying you must have been skying they must have been skying

Negation

Simple form	V-ing form
I mustn't sky you mustn't sky she mustn't sky we mustn't sky you mustn't sky they mustn't sky	I mustn't be skying you mustn't be skying she mustn't be skying we mustn't be skying you mustn't be skying they mustn't be skying
Perfect	V-ing perfect
I mustn't have skied you mustn't have skied she mustn't have skied we mustn't have skied you mustn't have skied they mustn't have skied	I mustn't have been skying you mustn't have been skying she mustn't have been skying we mustn't have been skying you mustn't have been skying they mustn't have been skying

Interrogative form

Simple form	V-ing form
must I sky? must you sky? must she sky? must we sky? must you sky? must they sky?	must I be skying? must you be skying? must she be skying? must we be skying? must you be skying? must they be skying?
Perfect	V-ing perfect
must I have skied? must you have skied? must she have skied? must we have skied? must you have skied? must they have skied?	must I have been skying? must you have been skying? must she have been skying? must we have been skying? must you have been skying? must they have been skying?

Interro-negative form

Simple form	V-ing form
mustn't I sky? mustn't you sky? mustn't she sky? mustn't we sky? mustn't you sky? mustn't they sky?	mustn't I be skying? mustn't you be skying? mustn't she be skying? mustn't we be skying? mustn't you be skying? mustn't they be skying?
Perfect	V-ing perfect
mustn't I have skied? mustn't you have skied? mustn't she have skied? mustn't we have skied? mustn't you have skied? mustn't they have skied?	mustn't I have been skying? mustn't you have been skying? mustn't she have been skying? mustn't we have been skying? mustn't you have been skying? mustn't they have been skying?