English verb conjugation
MUST CURTSY

Regular verb: curtsy - curtsied - curtsied

Affirmation

Simple form	V-ing form
I must curtsy you must curtsy she must curtsy we must curtsy you must curtsy they must curtsy	I must be curtsying you must be curtsying she must be curtsying we must be curtsying you must be curtsying they must be curtsying
Perfect	V-ing perfect
I must have curtsied you must have curtsied she must have curtsied we must have curtsied you must have curtsied they must have curtsied	I must have been curtsying you must have been curtsying she must have been curtsying we must have been curtsying you must have been curtsying they must have been curtsying

Negation

Simple form	V-ing form
I mustn't curtsy you mustn't curtsy she mustn't curtsy we mustn't curtsy you mustn't curtsy they mustn't curtsy	I mustn't be curtsying you mustn't be curtsying she mustn't be curtsying we mustn't be curtsying you mustn't be curtsying they mustn't be curtsying
Perfect	V-ing perfect
I mustn't have curtsied you mustn't have curtsied she mustn't have curtsied we mustn't have curtsied you mustn't have curtsied they mustn't have curtsied	I mustn't have been curtsying you mustn't have been curtsying she mustn't have been curtsying we mustn't have been curtsying you mustn't have been curtsying they mustn't have been curtsying

Interrogative form

Simple form	V-ing form
must I curtsy? must you curtsy? must she curtsy? must we curtsy? must you curtsy? must they curtsy?	must I be curtsying? must you be curtsying? must she be curtsying? must we be curtsying? must you be curtsying? must they be curtsying?
Perfect	V-ing perfect
must I have curtsied? must you have curtsied? must she have curtsied? must we have curtsied? must you have curtsied? must they have curtsied?	must I have been curtsying? must you have been curtsying? must she have been curtsying? must we have been curtsying? must you have been curtsying? must they have been curtsying?

Interro-negative form

Simple form	V-ing form
mustn't I curtsy? mustn't you curtsy? mustn't she curtsy? mustn't we curtsy? mustn't you curtsy? mustn't they curtsy?	mustn't I be curtsying? mustn't you be curtsying? mustn't she be curtsying? mustn't we be curtsying? mustn't you be curtsying? mustn't they be curtsying?
Perfect	V-ing perfect
mustn't I have curtsied? mustn't you have curtsied? mustn't she have curtsied? mustn't we have curtsied? mustn't you have curtsied? mustn't they have curtsied?	mustn't I have been curtsying? mustn't you have been curtsying? mustn't she have been curtsying? mustn't we have been curtsying? mustn't you have been curtsying? mustn't they have been curtsying?