✨ ベストアンサー ✨
(6) It is (clear) (that) (he) (is) (sleeping). <形式主語> ⁂live:不要
(7) My mobile phone rang (while) (I) (was) (eating) (dinner). ⁂am:不要
(8) Please let me know (if) (you) (need) (any) (help). ⁂me:不要
(9) They left early, (so) (they'll) (be) (able to) (get) good seats. ⁂because:不要
(10) He (felt) (so) (uneasy) (that) (he) called his teacher. ⁂such:不要
※so+形容詞・副詞(…) that+S+V~ とても…なのでSが~する
参考にしてください。