(6) (a) Since the clerk had not finished his work, he couldn't go to the party.
(b) ( ) ( ) finished his work, the clerk couldn't go to the party.
(7) (a) As she had heard the story before, she didn't want to hear it again.
) the story before, she didn't want to hear it again.
(b) (
) (
(京都
(8) (a) His father was dead, so he had to give up school.
(b) His father (
) dead, he had to give up school.
(柱
(9) (a) Because there was no bus service, I had to walk home.
) no bus service, I had to walk home.
(b) ( ) (
(10) (a) It was a fine day yesterday. I took my son fishing.
(b) (
) (
) a fine day yesterday, I took my son fishing.