I can codify you can codify he can codify we can codify you can codify they can codify
V-ing form
I can be codifying you can be codifying he can be codifying we can be codifying you can be codifying they can be codifying
Perfect
I can have codified you can have codified he can have codified we can have codified you can have codified they can have codified
V-ing perfect
I can have been codifying you can have been codifying he can have been codifying we can have been codifying you can have been codifying they can have been codifying
Negation
Simple form
I can't codify you can't codify he can't codify we can't codify you can't codify they can't codify
V-ing form
I can't be codifying you can't be codifying he can't be codifying we can't be codifying you can't be codifying they can't be codifying
Perfect
I can't have codified you can't have codified he can't have codified we can't have codified you can't have codified they can't have codified
V-ing perfect
I can't have been codifying you can't have been codifying he can't have been codifying we can't have been codifying you can't have been codifying they can't have been codifying
Interrogative form
Simple form
can I codify? can you codify? can he codify? can we codify? can you codify? can they codify?
V-ing form
can I be codifying? can you be codifying? can he be codifying? can we be codifying? can you be codifying? can they be codifying?
Perfect
can I have codified? can you have codified? can he have codified? can we have codified? can you have codified? can they have codified?
V-ing perfect
can I have been codifying? can you have been codifying? can he have been codifying? can we have been codifying? can you have been codifying? can they have been codifying?
Interro-negative form
Simple form
can't I codify? can't you codify? can't he codify? can't we codify? can't you codify? can't they codify?
V-ing form
can't I be codifying? can't you be codifying? can't he be codifying? can't we be codifying? can't you be codifying? can't they be codifying?
Perfect
can't I have codified? can't you have codified? can't he have codified? can't we have codified? can't you have codified? can't they have codified?
V-ing perfect
can't I have been codifying? can't you have been codifying? can't he have been codifying? can't we have been codifying? can't you have been codifying? can't they have been codifying?