2
(6) were ← would talk
(7) finishes/has finished ← 未来の内容を表す副詞節は現在形(あるいは現在完了形)
(8) were ← 仮定法過去:現在の事実の反対を表す
(9) knew ← I wish があるので仮定法過去
(10) were ← would be
3
(1) I would never do this if I were older than you.
(2) My father looks as if he were a doctor.
(3) I wish there were nothing to worry about.
(4) If it is sunny tomorrow, my sister will be happier.
(5) What would you do if you had no money?
(6) I would not go to school if I didn't like my classmates.
(7) My little brother wishes he could play video games all day.
(8) He told us the story as if it were based on a true story.
以上です。