How do I translate these English sentences into first-order logic without quantifiers?

Question

I have to translate the following English sentences into First-Order Logic without using quantifiers:

1. Everyone on flight 815 has a story.
2. No one knows what is inside the hatch.
3. Someone on the island isn't on the flight manifest.

I have tried it, but can't translate without using ∀ and ∃:

1. $\forall x, \; \text{flight815}(x) \rightarrow \text{story}(x)$
2. $\forall x \neg(\text{knows}(x) \rightarrow \text{inside hatch}(x))$ // not sure about this OR $\neg \exists x, \; \text{knows}(x, \text{inside hatch})$
3. $\exists x, \; \text{island}(x) \land \neg(\text{flight manifest}(x))$

Is it possible to do it? If not, why?

Refer to chapter 8 of Artificial Intelligence: A Modern Approach (3rd edition). Stuart Russell and Peter Norvig, Prentice Hall (2010)