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 couldn't twitch you couldn't twitch he couldn't twitch we couldn't twitch you couldn't twitch they couldn't twitch	I couldn't be twitching you couldn't be twitching he couldn't be twitching we couldn't be twitching you couldn't be twitching they couldn't be twitching
Perfect	V-ing perfect
I couldn't have twitched you couldn't have twitched he couldn't have twitched we couldn't have twitched you couldn't have twitched they couldn't have twitched	I couldn't have been twitching you couldn't have been twitching he couldn't have been twitching we couldn't have been twitching you couldn't have been twitching they couldn't 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
couldn't I twitch? couldn't you twitch? couldn't he twitch? couldn't we twitch? couldn't you twitch? couldn't they twitch?	couldn't I be twitching? couldn't you be twitching? couldn't he be twitching? couldn't we be twitching? couldn't you be twitching? couldn't they be twitching?
Perfect	V-ing perfect
couldn't I have twitched? couldn't you have twitched? couldn't he have twitched? couldn't we have twitched? couldn't you have twitched? couldn't they have twitched?	couldn't I have been twitching? couldn't you have been twitching? couldn't he have been twitching? couldn't we have been twitching? couldn't you have been twitching? couldn't they have been twitching?