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 can't decode you can't decode he can't decode we can't decode you can't decode they can't decode
V-ing form
I can't be decoding you can't be decoding he can't be decoding we can't be decoding you can't be decoding they can't be decoding
Perfect
I can't have decoded you can't have decoded he can't have decoded we can't have decoded you can't have decoded they can't have decoded
V-ing perfect
I can't have been decoding you can't have been decoding he can't have been decoding we can't have been decoding you can't have been decoding they can't 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't I decode? can't you decode? can't he decode? can't we decode? can't you decode? can't they decode?
V-ing form
can't I be decoding? can't you be decoding? can't he be decoding? can't we be decoding? can't you be decoding? can't they be decoding?
Perfect
can't I have decoded? can't you have decoded? can't he have decoded? can't we have decoded? can't you have decoded? can't they have decoded?
V-ing perfect
can't I have been decoding? can't you have been decoding? can't he have been decoding? can't we have been decoding? can't you have been decoding? can't they have been decoding?