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 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	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 	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 	
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? 	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?