Why wouldn't you want an LLM for a language learning tool? Language is one of things I would trust an LLM completely on. Have you ever seen ChatGPT make an English mistake?
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Even in British I'm not sure how widely they actually use it - do they say "I've a car" and "I haven't a car"?
Contractions are common in Australian English to, though becoming less so due to the influence of US English.