あなたを助けられなくて残念です。

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

deplorable; bad luck; regret; disappointment

be; is