could twit
Verbo regular: twit - twitted- twitted

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could twit
you could twit
he could twit
we could twit
you could twit
they could twit 	I could be twitting
you could be twitting
he could be twitting
we could be twitting
you could be twitting
they could be twitting	I could have twitted
you could have twitted
he could have twitted
we could have twitted
you could have twitted
they could have twitted	I could have been twitting
you could have been twitting
he could have been twitting
we could have been twitting
you could have been twitting
they could have been twitting	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't twit
you couldn't twit
he couldn't twit
we couldn't twit
you couldn't twit
they couldn't twit 	I couldn't be twitting
you couldn't be twitting
he couldn't be twitting
we couldn't be twitting
you couldn't be twitting
they couldn't be twitting	I couldn't have twitted
you couldn't have twitted
he couldn't have twitted
we couldn't have twitted
you couldn't have twitted
they couldn't have twitted	I couldn't have been twitting
you couldn't have been twitting
he couldn't have been twitting
we couldn't have been twitting
you couldn't have been twitting
they couldn't have been twitting	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I twit?
could you twit?
could he twit?
could we twit?
could you twit?
could they twit? 	could I be twitting?
could you be twitting?
could he be twitting?
could we be twitting?
could you be twitting?
could they be twitting? 	could I have twitted?
could you have twitted?
could he have twitted?
could we have twitted?
could you have twitted?
could they have twitted? 	could I have been twitting?
could you have been twitting?
could he have been twitting?
could we have been twitting?
could you have been twitting?
could they have been twitting? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I twit?
couldn't you twit?
couldn't he twit?
couldn't we twit?
couldn't you twit?
couldn't they twit? 	couldn't I be twitting?
couldn't you be twitting?
couldn't he be twitting?
couldn't we be twitting?
couldn't you be twitting?
couldn't they be twitting? 	couldn't I have twitted?
couldn't you have twitted?
couldn't he have twitted?
couldn't we have twitted?
couldn't you have twitted?
couldn't they have twitted? 	couldn't I have been twitting?
couldn't you have been twitting?
couldn't he have been twitting?
couldn't we have been twitting?
couldn't you have been twitting?
couldn't they have been twitting?