"a and e are both larger than c, but neither is large"
I thought the translation $$\large (\text{Larger}(a, c)\land \text{Larger}(e, c))\land\lnot(\text{Large}(a)\land \text{Large}(e))$$ would be correct but I am told that it is not. Does anyone know what it would be? The main part of the question, which includes this sentences with others, was to use the translation of
If P, then Q
translates as $$\textbf{P}\rightarrow\textbf{Q}$$
Based on comments, the answer would then be $$\large (\text{Larger}(a, c)\land \text{Larger}(e, c))\land\lnot(\text{Large}(a)\lor\text{Large}(e))$$
"Neither is Foo" means "Not (Either One is Foo)" means "Both are Not Foo," so the second part of your clause should read,
$$\lnot\text{Large}(a)\land\lnot\text{Large}(e)$$
which can be derived from the "Not (Either One is Foo)" by De Morgan's laws,
$$\lnot(\text{Large}(a)\lor\text{Large}(e))$$