Final answer:
True. Facial expressions, mouth shapes, and other non-manual expressions are indeed an integral part of signs in languages like ASL, making the statement true. These features help convey emotions and grammatical constructs, underpinning the universal nature of nonverbal communication.
Step-by-step explanation:
The correct answer to the student's question is true. Facial expressions, mouth shapes, and other non-manual expressions do indeed become part of signs as well. In the context of nonverbal communication, these elements play a significant role in conveying emotions and intentions. For example, in American Sign Language (ASL) and other sign languages, facial expressions and mouth shapes are integral components of the grammar and meaning of the signs. They can modify and clarify the meaning of the hand signs to express different emotions or grammatical constructs such as questions or negations. This principle of nonverbal communication holds true across different cultures, where body language and facial expressions convey emotional states and intentions, often in a universal manner.