English verb conjugation
COULD CURTSY

Regular verb: curtsy - curtsied - curtsied

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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