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