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 cannot just you cannot just he cannot just we cannot just you cannot just they cannot just
V-ing form
I cannot be justing you cannot be justing he cannot be justing we cannot be justing you cannot be justing they cannot be justing
Perfect
I cannot have justed you cannot have justed he cannot have justed we cannot have justed you cannot have justed they cannot have justed
V-ing perfect
I cannot have been justing you cannot have been justing he cannot have been justing we cannot have been justing you cannot have been justing they cannot 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 I not just? can you not just? can he not just? can we not just? can you not just? can they not just?
V-ing form
can I not be justing? can you not be justing? can he not be justing? can we not be justing? can you not be justing? can they not be justing?
Perfect
can I not have justed? can you not have justed? can he not have justed? can we not have justed? can you not have justed? can they not have justed?
V-ing perfect
can I not have been justing? can you not have been justing? can he not have been justing? can we not have been justing? can you not have been justing? can they not have been justing?