could knot
Regular verb: knot - knotted- knotted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could knot
you could knot
she could knot
we could knot
you could knot
they could knot 	I could be knotting
you could be knotting
she could be knotting
we could be knotting
you could be knotting
they could be knotting	I could have knotted
you could have knotted
she 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
she 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
she 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
she 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
she 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
she 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 she knot?
could we knot?
could you knot?
could they knot? 	could I be knotting?
could you be knotting?
could she be knotting?
could we be knotting?
could you be knotting?
could they be knotting? 	could I have knotted?
could you have knotted?
could she 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 she 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 she 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 she 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 she 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 she have been knotting?
couldn't we have been knotting?
couldn't you have been knotting?
couldn't they have been knotting?