I can decode you can decode she can decode we can decode you can decode they can decode
V-ing form
I can be decoding you can be decoding she can be decoding we can be decoding you can be decoding they can be decoding
Perfect
I can have decoded you can have decoded she can have decoded we can have decoded you can have decoded they can have decoded
V-ing perfect
I can have been decoding you can have been decoding she can have been decoding we can have been decoding you can have been decoding they can have been decoding
Negation
Simple form
I cannot decode you cannot decode she cannot decode we cannot decode you cannot decode they cannot decode
V-ing form
I cannot be decoding you cannot be decoding she cannot be decoding we cannot be decoding you cannot be decoding they cannot be decoding
Perfect
I cannot have decoded you cannot have decoded she cannot have decoded we cannot have decoded you cannot have decoded they cannot have decoded
V-ing perfect
I cannot have been decoding you cannot have been decoding she cannot have been decoding we cannot have been decoding you cannot have been decoding they cannot have been decoding
Interrogative form
Simple form
can I decode? can you decode? can she decode? can we decode? can you decode? can they decode?
V-ing form
can I be decoding? can you be decoding? can she be decoding? can we be decoding? can you be decoding? can they be decoding?
Perfect
can I have decoded? can you have decoded? can she have decoded? can we have decoded? can you have decoded? can they have decoded?
V-ing perfect
can I have been decoding? can you have been decoding? can she have been decoding? can we have been decoding? can you have been decoding? can they have been decoding?
Interro-negative form
Simple form
can I not decode? can you not decode? can she not decode? can we not decode? can you not decode? can they not decode?
V-ing form
can I not be decoding? can you not be decoding? can she not be decoding? can we not be decoding? can you not be decoding? can they not be decoding?
Perfect
can I not have decoded? can you not have decoded? can she not have decoded? can we not have decoded? can you not have decoded? can they not have decoded?
V-ing perfect
can I not have been decoding? can you not have been decoding? can she not have been decoding? can we not have been decoding? can you not have been decoding? can they not have been decoding?