How to sign Understand: BSL Sign of the Day 148 The topic for this week is "Understanding". Learn how to sign 'I understand', 'I don't understand' and 'Do you understand?' in BSL. Notice the changes in the facial expressions and head movements to show the difference between the three. The example sentence in English is: A: The train is late. The platform has changed, it's now number 4. Do you understand? B: Yes I understand, thank you. #BSL #BritishSignLanguage #BSLSignoftheDay | Commanding Hand