I can just you can just he can just we can just you can just they can just
V-ing form
I can be justing you can be justing he can be justing we can be justing you can be justing they can be justing
Perfect
I can have justed you can have justed he 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 he 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 he 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 he 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 he 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 he 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 he just? can we just? can you just? can they just?
V-ing form
can I be justing? can you be justing? can he be justing? can we be justing? can you be justing? can they be justing?
Perfect
can I have justed? can you have justed? can he 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 he 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 he 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 he 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 he 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 he have been justing? can't we have been justing? can't you have been justing? can't they have been justing?