Hi there! Let's look at your sentence: "Squirrels keep nuts and cones inside hollows for winter."
This sentence is actually very good! It tells us what squirrels do and where they keep their food.
Here’s why it works:
- Squirrels is the subject (who the sentence is about). It is plural, so it means more than one squirrel.
- Keep is the action (what the squirrels do). Because the subject is plural, we use 'keep' (not 'keeps').
- Nuts and cones are the things squirrels keep.
- Inside hollows tells us where they keep the nuts and cones.
- For winter tells us why they keep them there (to eat in winter).
So the sentence means: Squirrels put nuts and cones inside hollow spaces so they can eat them during winter.
If you want, you could make it even clearer by saying: "Squirrels keep nuts and cones inside hollow places to eat in winter." But your sentence is already correct and clear!