Final answer:
In ASL, the signs UNDERSTAND, OR, and PLUS belong to the closed lexical category of conjunctions, which is a subcategory of adverbs.
Step-by-step explanation:
In ASL, the signs UNDERSTAND, OR, and PLUS belong to the closed lexical category of conjunctions, which is a subcategory of adverbs. Conjunctions are words that connect parts of a sentence or different sentences together and express relationships such as addition, choice, and understanding. Examples of these signs used in ASL sentences:
UNDERSTAND: I UNDERSTAND YOU (using head nodding)
OR: DO YOU WANT WATER OR JUICE?
PLUS: I HAVE TWO CATS PLUS A DOG.