OET interlinear DEU 28:40

uW Translation Notes:

Note 1 topic: figures-of-speech / explicit

וְ⁠שֶׁ֨מֶן֙ לֹ֣א תָס֔וּךְ כִּ֥י יִשַּׁ֖ל זֵיתֶֽ⁠ךָ

(Some words not found in UHB: olive_trees there_~_be to/for=yourself(m) in=all territory_of,your and,oil not anoint that/for/because/then/when drop_off olive[s]_of,your )

The implication is that the olives will become detached, or fall, from the trees before they are ripe enough to produce oil. You could include this information if that would be helpful to your readers. Alternate translation: [but you will not be able to make oil to grease yourself with, for your olives will fall] or [but you will not grease yourself with oil from your olives, for they will fall]

Note 2 topic: figures-of-speech / activepassive

יִשַּׁ֖ל זֵיתֶֽ⁠ךָ

(Some words not found in UHB: olive_trees there_~_be to/for=yourself(m) in=all territory_of,your and,oil not anoint that/for/because/then/when drop_off olive[s]_of,your )

The expression will become detached is a passive verbal form. If your language would not use that form, you could express the idea in active form or in another way that is natural in your language. If you need to say who does the action, the context indicates that it is Yahweh. Alternate translation: [Yahweh will cause your olives to fall off]