I can just you can just she can just we can just you can just they can just
V-ing form
I can be justing you can be justing she can be justing we can be justing you can be justing they can be justing
Perfect
I can have justed you can have justed she can have justed we can have justed you can have justed they can have justed
V-ing perfect
I can have been justing you can have been justing she can have been justing we can have been justing you can have been justing they can have been justing
Negation
Simple form
I can't just you can't just she can't just we can't just you can't just they can't just
V-ing form
I can't be justing you can't be justing she can't be justing we can't be justing you can't be justing they can't be justing
Perfect
I can't have justed you can't have justed she can't have justed we can't have justed you can't have justed they can't have justed
V-ing perfect
I can't have been justing you can't have been justing she can't have been justing we can't have been justing you can't have been justing they can't have been justing
Interrogative form
Simple form
can I just? can you just? can she just? can we just? can you just? can they just?
V-ing form
can I be justing? can you be justing? can she be justing? can we be justing? can you be justing? can they be justing?
Perfect
can I have justed? can you have justed? can she have justed? can we have justed? can you have justed? can they have justed?
V-ing perfect
can I have been justing? can you have been justing? can she have been justing? can we have been justing? can you have been justing? can they have been justing?
Interro-negative form
Simple form
can't I just? can't you just? can't she just? can't we just? can't you just? can't they just?
V-ing form
can't I be justing? can't you be justing? can't she be justing? can't we be justing? can't you be justing? can't they be justing?
Perfect
can't I have justed? can't you have justed? can't she have justed? can't we have justed? can't you have justed? can't they have justed?
V-ing perfect
can't I have been justing? can't you have been justing? can't she have been justing? can't we have been justing? can't you have been justing? can't they have been justing?