次の段落に基づいて質問する
7. "We propose a novel analysis of the morphological system of the Tlingit language, which emphasizes the role of lexical and derivational morphemes in marking both argument structure and tense/aspect distinctions."
1. What is the focus of the analysis in the Tlingit language?
2. Which morphemes play a significant role in marking argument structure and tense/aspect? 
3. Who proposes the analysis of the morphological system of the Tlingit language?