Answer: Where did she say? There are many books in their school library. Here is the object clause, which has been said in the past tense. She said the main clause and the object clause was a declarative sentence. Tenses and main sentences are called past tense, which means that there are many books in the library, and many books are plural. So I used there were, plus the adverbial of place in their school library, so the answer is that she said there? There are many books in their school library.