can thorn
Regular verb: thorn - thorned- thorned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can thorn
you can thorn
he can thorn
we can thorn
you can thorn
they can thorn 	I can be thorning
you can be thorning
he can be thorning
we can be thorning
you can be thorning
they can be thorning	I can have thorned
you can have thorned
he can have thorned
we can have thorned
you can have thorned
they can have thorned	I can have been thorning
you can have been thorning
he can have been thorning
we can have been thorning
you can have been thorning
they can have been thorning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't thorn
you can't thorn
he can't thorn
we can't thorn
you can't thorn
they can't thorn 	I can't be thorning
you can't be thorning
he can't be thorning
we can't be thorning
you can't be thorning
they can't be thorning	I can't have thorned
you can't have thorned
he can't have thorned
we can't have thorned
you can't have thorned
they can't have thorned	I can't have been thorning
you can't have been thorning
he can't have been thorning
we can't have been thorning
you can't have been thorning
they can't have been thorning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I thorn?
can you thorn?
can he thorn?
can we thorn?
can you thorn?
can they thorn? 	can I be thorning?
can you be thorning?
can he be thorning?
can we be thorning?
can you be thorning?
can they be thorning? 	can I have thorned?
can you have thorned?
can he have thorned?
can we have thorned?
can you have thorned?
can they have thorned? 	can I have been thorning?
can you have been thorning?
can he have been thorning?
can we have been thorning?
can you have been thorning?
can they have been thorning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I thorn?
can't you thorn?
can't he thorn?
can't we thorn?
can't you thorn?
can't they thorn? 	can't I be thorning?
can't you be thorning?
can't he be thorning?
can't we be thorning?
can't you be thorning?
can't they be thorning? 	can't I have thorned?
can't you have thorned?
can't he have thorned?
can't we have thorned?
can't you have thorned?
can't they have thorned? 	can't I have been thorning?
can't you have been thorning?
can't he have been thorning?
can't we have been thorning?
can't you have been thorning?
can't they have been thorning?