English verb conjugation
COULD TWITCH

Regular verb: twitch - twitched - twitched

Affirmation

Simple form	V-ing form
I could twitch you could twitch he could twitch we could twitch you could twitch they could twitch	I could be twitching you could be twitching he could be twitching we could be twitching you could be twitching they could be twitching
Perfect	V-ing perfect
I could have twitched you could have twitched he could have twitched we could have twitched you could have twitched they could have twitched	I could have been twitching you could have been twitching he could have been twitching we could have been twitching you could have been twitching they could have been twitching

Negation

Simple form	V-ing form
I could not twitch you could not twitch he could not twitch we could not twitch you could not twitch they could not twitch	I could not be twitching you could not be twitching he could not be twitching we could not be twitching you could not be twitching they could not be twitching
Perfect	V-ing perfect
I could not have twitched you could not have twitched he could not have twitched we could not have twitched you could not have twitched they could not have twitched	I could not have been twitching you could not have been twitching he could not have been twitching we could not have been twitching you could not have been twitching they could not have been twitching

Interrogative form

Simple form	V-ing form
could I twitch? could you twitch? could he twitch? could we twitch? could you twitch? could they twitch?	could I be twitching? could you be twitching? could he be twitching? could we be twitching? could you be twitching? could they be twitching?
Perfect	V-ing perfect
could I have twitched? could you have twitched? could he have twitched? could we have twitched? could you have twitched? could they have twitched?	could I have been twitching? could you have been twitching? could he have been twitching? could we have been twitching? could you have been twitching? could they have been twitching?

Interro-negative form

Simple form	V-ing form
could I not twitch? could you not twitch? could he not twitch? could we not twitch? could you not twitch? could they not twitch?	could I not be twitching? could you not be twitching? could he not be twitching? could we not be twitching? could you not be twitching? could they not be twitching?
Perfect	V-ing perfect
could I not have twitched? could you not have twitched? could he not have twitched? could we not have twitched? could you not have twitched? could they not have twitched?	could I not have been twitching? could you not have been twitching? could he not have been twitching? could we not have been twitching? could you not have been twitching? could they not have been twitching?