could twitch
Regular verb: twitch - twitched- twitched

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?