English verb conjugation
COULD TWIN

Regular verb: twin - twinned - twinned

Affirmation

Simple form	V-ing form
I could twin you could twin he could twin we could twin you could twin they could twin	I could be twinning you could be twinning he could be twinning we could be twinning you could be twinning they could be twinning
Perfect	V-ing perfect
I could have twinned you could have twinned he could have twinned we could have twinned you could have twinned they could have twinned	I could have been twinning you could have been twinning he could have been twinning we could have been twinning you could have been twinning they could have been twinning

Negation

Simple form	V-ing form
I could not twin you could not twin he could not twin we could not twin you could not twin they could not twin	I could not be twinning you could not be twinning he could not be twinning we could not be twinning you could not be twinning they could not be twinning
Perfect	V-ing perfect
I could not have twinned you could not have twinned he could not have twinned we could not have twinned you could not have twinned they could not have twinned	I could not have been twinning you could not have been twinning he could not have been twinning we could not have been twinning you could not have been twinning they could not have been twinning

Interrogative form

Simple form	V-ing form
could I twin? could you twin? could he twin? could we twin? could you twin? could they twin?	could I be twinning? could you be twinning? could he be twinning? could we be twinning? could you be twinning? could they be twinning?
Perfect	V-ing perfect
could I have twinned? could you have twinned? could he have twinned? could we have twinned? could you have twinned? could they have twinned?	could I have been twinning? could you have been twinning? could he have been twinning? could we have been twinning? could you have been twinning? could they have been twinning?

Interro-negative form

Simple form	V-ing form
could I not twin? could you not twin? could he not twin? could we not twin? could you not twin? could they not twin?	could I not be twinning? could you not be twinning? could he not be twinning? could we not be twinning? could you not be twinning? could they not be twinning?
Perfect	V-ing perfect
could I not have twinned? could you not have twinned? could he not have twinned? could we not have twinned? could you not have twinned? could they not have twinned?	could I not have been twinning? could you not have been twinning? could he not have been twinning? could we not have been twinning? could you not have been twinning? could they not have been twinning?