This sentence is representing a passive voice, well "Jacob ate" is telling us that we already did it. And "at the party" says that we was eating at the party, but he's not eating currently.
Luto is mourning.
Example: feel or show deep sorrow or regret for (someone or their death), typically by following conventions such as the wearing of black clothes.
Example: the expression of deep sorrow for someone who has died, typically involving following certain conventions such as wearing black clothes.
Answer:
If you're looking for the subject, the answer is "Unless I can find my sneakers"
If you're looking for the <u>predicate</u>, the answer is "<u>I won't be able to go to the game</u>"
Explanation: