Let's look at your sentences step by step and make them easy and correct:
Your original sentences:
Many birds live in the city. They make nests under bridges, in the gaps and eaves of tall buildings. In winter, people hang bird feeders full of seeds on windows and trees to give birds food and keep them strong.
Corrected version:
Many birds live in the city. They make nests under bridges and in the gaps and eaves of tall buildings. In winter, people hang bird feeders full of seeds on windows and trees to give food to the birds and help keep them strong.
Explanation:
- We added “and” between “under bridges” and “in the gaps” to join the two places nicely.
- We changed “give birds food” to “give food to the birds” to sound clearer.
- And “keep them strong” became “help keep them strong” to show how feeding helps the birds.
Great job describing how birds live and how people help them!