could sit
Irregular verb: sit - sat- sat

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could sit
you could sit
he could sit
we could sit
you could sit
they could sit 	I could be sitting
you could be sitting
he could be sitting
we could be sitting
you could be sitting
they could be sitting	I could have sat
you could have sat
he could have sat
we could have sat
you could have sat
they could have sat	I could have been sitting
you could have been sitting
he could have been sitting
we could have been sitting
you could have been sitting
they could have been sitting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't sit
you couldn't sit
he couldn't sit
we couldn't sit
you couldn't sit
they couldn't sit 	I couldn't be sitting
you couldn't be sitting
he couldn't be sitting
we couldn't be sitting
you couldn't be sitting
they couldn't be sitting	I couldn't have sat
you couldn't have sat
he couldn't have sat
we couldn't have sat
you couldn't have sat
they couldn't have sat	I couldn't have been sitting
you couldn't have been sitting
he couldn't have been sitting
we couldn't have been sitting
you couldn't have been sitting
they couldn't have been sitting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I sit?
could you sit?
could he sit?
could we sit?
could you sit?
could they sit? 	could I be sitting?
could you be sitting?
could he be sitting?
could we be sitting?
could you be sitting?
could they be sitting? 	could I have sat?
could you have sat?
could he have sat?
could we have sat?
could you have sat?
could they have sat? 	could I have been sitting?
could you have been sitting?
could he have been sitting?
could we have been sitting?
could you have been sitting?
could they have been sitting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I sit?
couldn't you sit?
couldn't he sit?
couldn't we sit?
couldn't you sit?
couldn't they sit? 	couldn't I be sitting?
couldn't you be sitting?
couldn't he be sitting?
couldn't we be sitting?
couldn't you be sitting?
couldn't they be sitting? 	couldn't I have sat?
couldn't you have sat?
couldn't he have sat?
couldn't we have sat?
couldn't you have sat?
couldn't they have sat? 	couldn't I have been sitting?
couldn't you have been sitting?
couldn't he have been sitting?
couldn't we have been sitting?
couldn't you have been sitting?
couldn't they have been sitting?