あなたを助けるのが私の義務です。

you (referring to someone of equal or lower status); dear (what a wife calls a husband)

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

to help; to save; to rescue; to give relief to; to spare (life); to reinforce; to promote; to abet

indicates possessive; nominalizes verbs and adjectives; substitutes for "ga" in subordinate phrases; (at sentence-end, falling tone) indicates a confident conclusion; (at sentence-end) indicates emotional emphasis; (at sentence-end, rising tone) indicates question

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

I; me; private affairs; personal matter; secrecy; selfishness

duty; obligation; responsibility

be; is