Expectation #4 in my classroom is "Ask Questions". Many students are afraid to ask questions out of fear that their peers may laugh, it may be a "stupid question", or other reasons that can cause them embarrassment. My students are starting to learn that they're free to ask questions and they will get an answer whether it be from me or another student. If the question is off-topic then it's easily redirected.
Here are six steps to teach your students how to ask their own questions.