I could codify you could codify she could codify we could codify you could codify they could codify
V-ing form
I could be codifying you could be codifying she could be codifying we could be codifying you could be codifying they could be codifying
Perfect
I could have codified you could have codified she could have codified we could have codified you could have codified they could have codified
V-ing perfect
I could have been codifying you could have been codifying she could have been codifying we could have been codifying you could have been codifying they could have been codifying
Negation
Simple form
I could not codify you could not codify she could not codify we could not codify you could not codify they could not codify
V-ing form
I could not be codifying you could not be codifying she could not be codifying we could not be codifying you could not be codifying they could not be codifying
Perfect
I could not have codified you could not have codified she could not have codified we could not have codified you could not have codified they could not have codified
V-ing perfect
I could not have been codifying you could not have been codifying she could not have been codifying we could not have been codifying you could not have been codifying they could not have been codifying
Interrogative form
Simple form
could I codify? could you codify? could she codify? could we codify? could you codify? could they codify?
V-ing form
could I be codifying? could you be codifying? could she be codifying? could we be codifying? could you be codifying? could they be codifying?
Perfect
could I have codified? could you have codified? could she have codified? could we have codified? could you have codified? could they have codified?
V-ing perfect
could I have been codifying? could you have been codifying? could she have been codifying? could we have been codifying? could you have been codifying? could they have been codifying?
Interro-negative form
Simple form
could I not codify? could you not codify? could she not codify? could we not codify? could you not codify? could they not codify?
V-ing form
could I not be codifying? could you not be codifying? could she not be codifying? could we not be codifying? could you not be codifying? could they not be codifying?
Perfect
could I not have codified? could you not have codified? could she not have codified? could we not have codified? could you not have codified? could they not have codified?
V-ing perfect
could I not have been codifying? could you not have been codifying? could she not have been codifying? could we not have been codifying? could you not have been codifying? could they not have been codifying?