Given an input sentence, edit the sentence such that it is grammatically correct and has similar meaning.
They're going to the bookstore to buy some book?
Are they going to the bookstore to buy some books?
Complete the following task based on the instruction and optional input provided.### Instruction:
Given an input sentence, edit the sentence such that it is grammatically correct and has similar meaning.

### Input:
They're going to the bookstore to buy some book?

### Output:
Are they going to the bookstore to buy some books?