Final answer:
Nonmanual signals in ASL play a key role in defining meaning and grammar in various sentence types such as questions, statements, and commands, even though the exact six sentence types are not specified.
Step-by-step explanation:
The question refers to the role of nonmanual signals in American Sign Language (ASL) syntax, specifically within six basic sentence types. Nonmanual signals include facial expressions, head movements, and body posture, playing a crucial role in conveying meaning in ASL. While the exact six sentence types are not provided in the reference materials, common ASL sentence types influenced by nonmanual signals typically include statements, yes/no questions, wh-questions, commands, conditionals, and topicalized sentences. For example, raising the eyebrows often accompanies yes/no questions, while furrowing brows may be used for wh-questions. Understanding nonmanual signals is essential for ASL syntax, as they can alter the meaning of signs and provide grammatical context that the signs alone may not convey.