can unknot
Regular verb: unknot - unknotted- unknotted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can unknot
you can unknot
he can unknot
we can unknot
you can unknot
they can unknot 	I can be unknotting
you can be unknotting
he can be unknotting
we can be unknotting
you can be unknotting
they can be unknotting	I can have unknotted
you can have unknotted
he can have unknotted
we can have unknotted
you can have unknotted
they can have unknotted	I can have been unknotting
you can have been unknotting
he can have been unknotting
we can have been unknotting
you can have been unknotting
they can have been unknotting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't unknot
you can't unknot
he can't unknot
we can't unknot
you can't unknot
they can't unknot 	I can't be unknotting
you can't be unknotting
he can't be unknotting
we can't be unknotting
you can't be unknotting
they can't be unknotting	I can't have unknotted
you can't have unknotted
he can't have unknotted
we can't have unknotted
you can't have unknotted
they can't have unknotted	I can't have been unknotting
you can't have been unknotting
he can't have been unknotting
we can't have been unknotting
you can't have been unknotting
they can't have been unknotting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I unknot?
can you unknot?
can he unknot?
can we unknot?
can you unknot?
can they unknot? 	can I be unknotting?
can you be unknotting?
can he be unknotting?
can we be unknotting?
can you be unknotting?
can they be unknotting? 	can I have unknotted?
can you have unknotted?
can he have unknotted?
can we have unknotted?
can you have unknotted?
can they have unknotted? 	can I have been unknotting?
can you have been unknotting?
can he have been unknotting?
can we have been unknotting?
can you have been unknotting?
can they have been unknotting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I unknot?
can't you unknot?
can't he unknot?
can't we unknot?
can't you unknot?
can't they unknot? 	can't I be unknotting?
can't you be unknotting?
can't he be unknotting?
can't we be unknotting?
can't you be unknotting?
can't they be unknotting? 	can't I have unknotted?
can't you have unknotted?
can't he have unknotted?
can't we have unknotted?
can't you have unknotted?
can't they have unknotted? 	can't I have been unknotting?
can't you have been unknotting?
can't he have been unknotting?
can't we have been unknotting?
can't you have been unknotting?
can't they have been unknotting?