I can decode you can decode he can decode we can decode you can decode they can decode
V-ing form
I can be decoding you can be decoding he can be decoding we can be decoding you can be decoding they can be decoding
Perfect
I can have decoded you can have decoded he 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 he 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 he cannot decode we cannot decode you cannot decode they cannot decode
V-ing form
I cannot be decoding you cannot be decoding he cannot be decoding we cannot be decoding you cannot be decoding they cannot be decoding
Perfect
I cannot have decoded you cannot have decoded he 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 he 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 he decode? can we decode? can you decode? can they decode?
V-ing form
can I be decoding? can you be decoding? can he be decoding? can we be decoding? can you be decoding? can they be decoding?
Perfect
can I have decoded? can you have decoded? can he 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 he 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 he 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 he 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 he 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 he not have been decoding? can we not have been decoding? can you not have been decoding? can they not have been decoding?