Though(),she can speak three foreign languages为什么是 young 啊?能说下分析过程么young is young youth being young

答案being young.这里though这个连词引导让步状语。形容词，名词，谓语动词不能做状语。只有being young这个现在分词（非谓语动词）才能做状语。

Though (she is) young,she can speak three foreign languages
省略了主语系动词