In this English vocabulary lesson, learn how to use "understandable" and "understand". "Understandable" and "understand' don't have the same meaning. We don't use "understandable" to say that you "understand" information. For example, if I explain the present perfect verb tense and you understand my explanation you can't say "that's understandable". You can only say "I understand". So when can you use "understandable". You can use "understandable" to say that you understand the reason behind som