can unjam
Regular verb: unjam - unjamed- unjamed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can unjam
you can unjam
he can unjam
we can unjam
you can unjam
they can unjam 	I can be unjaming
you can be unjaming
he can be unjaming
we can be unjaming
you can be unjaming
they can be unjaming	I can have unjamed
you can have unjamed
he can have unjamed
we can have unjamed
you can have unjamed
they can have unjamed	I can have been unjaming
you can have been unjaming
he can have been unjaming
we can have been unjaming
you can have been unjaming
they can have been unjaming	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot unjam
you cannot unjam
he cannot unjam
we cannot unjam
you cannot unjam
they cannot unjam 	I cannot be unjaming
you cannot be unjaming
he cannot be unjaming
we cannot be unjaming
you cannot be unjaming
they cannot be unjaming	I cannot have unjamed
you cannot have unjamed
he cannot have unjamed
we cannot have unjamed
you cannot have unjamed
they cannot have unjamed	I cannot have been unjaming
you cannot have been unjaming
he cannot have been unjaming
we cannot have been unjaming
you cannot have been unjaming
they cannot have been unjaming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I unjam?
can you unjam?
can he unjam?
can we unjam?
can you unjam?
can they unjam? 	can I be unjaming?
can you be unjaming?
can he be unjaming?
can we be unjaming?
can you be unjaming?
can they be unjaming? 	can I have unjamed?
can you have unjamed?
can he have unjamed?
can we have unjamed?
can you have unjamed?
can they have unjamed? 	can I have been unjaming?
can you have been unjaming?
can he have been unjaming?
can we have been unjaming?
can you have been unjaming?
can they have been unjaming? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not unjam?
can you not unjam?
can he not unjam?
can we not unjam?
can you not unjam?
can they not unjam? 	can I not be unjaming?
can you not be unjaming?
can he not be unjaming?
can we not be unjaming?
can you not be unjaming?
can they not be unjaming? 	can I not have unjamed?
can you not have unjamed?
can he not have unjamed?
can we not have unjamed?
can you not have unjamed?
can they not have unjamed? 	can I not have been unjaming?
can you not have been unjaming?
can he not have been unjaming?
can we not have been unjaming?
can you not have been unjaming?
can they not have been unjaming?