Pointing to book but looking at my face: "Teacher, how to say this?"
Because often the students memorize English words the same way they memorize Chinese characters—that is, you'd better know how to pronounce this the next time you see it. But when they get to a new word, they have no idea how to sound it out. Why have an alphabet if you're not going to use it?
On a related note, several parents complain whenever I try to teach the alphabet to their three-to-five-year-olds. It's not important, they say.