I can knot you can knot she can knot we can knot you can knot they can knot
V-ing form
I can be knotting you can be knotting she can be knotting we can be knotting you can be knotting they can be knotting
Perfect
I can have knotted you can have knotted she can have knotted we can have knotted you can have knotted they can have knotted
V-ing perfect
I can have been knotting you can have been knotting she can have been knotting we can have been knotting you can have been knotting they can have been knotting
Negation
Simple form
I cannot knot you cannot knot she cannot knot we cannot knot you cannot knot they cannot knot
V-ing form
I cannot be knotting you cannot be knotting she cannot be knotting we cannot be knotting you cannot be knotting they cannot be knotting
Perfect
I cannot have knotted you cannot have knotted she cannot have knotted we cannot have knotted you cannot have knotted they cannot have knotted
V-ing perfect
I cannot have been knotting you cannot have been knotting she cannot have been knotting we cannot have been knotting you cannot have been knotting they cannot have been knotting
Interrogative form
Simple form
can I knot? can you knot? can she knot? can we knot? can you knot? can they knot?
V-ing form
can I be knotting? can you be knotting? can she be knotting? can we be knotting? can you be knotting? can they be knotting?
Perfect
can I have knotted? can you have knotted? can she have knotted? can we have knotted? can you have knotted? can they have knotted?
V-ing perfect
can I have been knotting? can you have been knotting? can she have been knotting? can we have been knotting? can you have been knotting? can they have been knotting?
Interro-negative form
Simple form
can I not knot? can you not knot? can she not knot? can we not knot? can you not knot? can they not knot?
V-ing form
can I not be knotting? can you not be knotting? can she not be knotting? can we not be knotting? can you not be knotting? can they not be knotting?
Perfect
can I not have knotted? can you not have knotted? can she not have knotted? can we not have knotted? can you not have knotted? can they not have knotted?
V-ing perfect
can I not have been knotting? can you not have been knotting? can she not have been knotting? can we not have been knotting? can you not have been knotting? can they not have been knotting?