could knot
Regular verb: knot - knotted- knotted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could knot
you could knot
he could knot
we could knot
you could knot
they could knot 	I could be knotting
you could be knotting
he could be knotting
we could be knotting
you could be knotting
they could be knotting	I could have knotted
you could have knotted
he could have knotted
we could have knotted
you could have knotted
they could have knotted	I could have been knotting
you could have been knotting
he could have been knotting
we could have been knotting
you could have been knotting
they could have been knotting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't knot
you couldn't knot
he couldn't knot
we couldn't knot
you couldn't knot
they couldn't knot 	I couldn't be knotting
you couldn't be knotting
he couldn't be knotting
we couldn't be knotting
you couldn't be knotting
they couldn't be knotting	I couldn't have knotted
you couldn't have knotted
he couldn't have knotted
we couldn't have knotted
you couldn't have knotted
they couldn't have knotted	I couldn't have been knotting
you couldn't have been knotting
he couldn't have been knotting
we couldn't have been knotting
you couldn't have been knotting
they couldn't have been knotting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I knot?
could you knot?
could he knot?
could we knot?
could you knot?
could they knot? 	could I be knotting?
could you be knotting?
could he be knotting?
could we be knotting?
could you be knotting?
could they be knotting? 	could I have knotted?
could you have knotted?
could he have knotted?
could we have knotted?
could you have knotted?
could they have knotted? 	could I have been knotting?
could you have been knotting?
could he have been knotting?
could we have been knotting?
could you have been knotting?
could they have been knotting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I knot?
couldn't you knot?
couldn't he knot?
couldn't we knot?
couldn't you knot?
couldn't they knot? 	couldn't I be knotting?
couldn't you be knotting?
couldn't he be knotting?
couldn't we be knotting?
couldn't you be knotting?
couldn't they be knotting? 	couldn't I have knotted?
couldn't you have knotted?
couldn't he have knotted?
couldn't we have knotted?
couldn't you have knotted?
couldn't they have knotted? 	couldn't I have been knotting?
couldn't you have been knotting?
couldn't he have been knotting?
couldn't we have been knotting?
couldn't you have been knotting?
couldn't they have been knotting?