Dave's ESL Cafe's Student Discussion Forums

[b7lake]

(1)He had offered to step down to taking responsibility for the incident.
(2)Moon said that he would take the responsibility for the election results.

(3)The troops will have responsibility for undertaking an independent security-related mission.
(4)He has the responsibility for many important policies.

Are all the sentences correct?
If so, how can I tell whether 'the' must be necessary in the sentences or not?

Thanks a lot for your help as always!