Here's why:
* Hands: Sign language uses handshapes, movements, and locations to convey meaning. Paying attention to the hands is crucial for understanding the signs.
* Face: Facial expressions are an integral part of sign language. They can change the meaning of a sign, provide emphasis, or convey emotions.
It's not appropriate to stare at someone's mouth when they are signing. Sign language is not based on lip reading, and focusing on the mouth can be distracting and disrespectful.
Remember: Just like with any language, focusing on the speaker's body language and facial expressions helps you understand and engage with the message being conveyed.