I have always asked questions, even now! I think it's important to ask questions, to be able understand your training better and execute what you're learning more effectively. Some think you're questioning/ doubting your instructor, but that's not necessarily the case. I think it helps you and your other classmates grow a bit more by being able to open up and ask. I've even asked my instructors about asking questions. They said to never feel like you can't ask. The only dumb question, is the one you didn't ask (well, you get the idea...).