Becoming fluent in ASL isn't about learning a few grammar rules. It is
about learning 10,000 tactics.
Just thinking via my fingers on the keyboard here.
I'm going to suggest that the issue really isn't about grammar.
I've pointed out time and again that in the "Linguistics of American Sign
Language" (3rd Ed.) textbook, on page 135, item #3 of the chapter summary it
states:
"The most basic word order in ASL sentences with transitive verbs is
Subject-Verb-Object."
If you want to argue that -- do so with the linguists at Gallaudet University
who wrote the book.
The real issue (IMHO) is about the 10,000 or so linguistic tactics advanced
users of the language use and apply to 10,000 different individual situations.
It isn't about a recipe or instruction list to follow and presto: You sign like
a Deaf person.
It is about the hard work and years of learning which of 10,000 paths gets you
to which of 10,000 communicative destination quickly and easily. (Classifiers,
directionality, NMMs, numerical incorporation, noun-verb pairing, spelling or
not spelling, one-handed signing, contrastive signing, rhetorical questioning,
topicalizing -- or not, reduced movements, mouthing -- or not, absent
references, eye-gazes, head tilts, cheek to shoulder raises, locatives,
reciprocals, pragmatics, institutional / generational / cultural knowledge
empowering efficient decisions -- and thousands of other tools in the toolbox.)
It is the difference between learning the "rules" of driving to pass a written
driving exam versus becoming a seasoned New York cabbie. The former can be
taught in a few hours of class. The later is going to take thousands of hours of
driving around town.
Notes:
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https://www.lifeprint.com/asl101/topics/subject-verb-object-asl-sentence-structure.htm