Check the correctness: "Ask me if you don't understand."

The assertion "Ask me if you don't understand" is correct because it encourages an open line of communication between the teacher and the students. This phrase fosters an environment where students feel comfortable expressing their doubts and seeking clarification. It is essential for effective learning, particularly in language acquisition where comprehension can often be elusive. This kind of supportive dialogue is beneficial regardless of the learners' proficiency level, as it promotes participation and ensures that students are actively engaged in the learning process. Thus, the message conveyed is universally applicable and a vital part of teaching strategy in any context.