（用 although 或 unless 将句子的两部分连接起来） you can't open the box／you have a knife

（用 although 或 unless 将句子的两部分连接起来） She won't tell others your secret／you permit her to do so

（用 although 或 unless 将句子的两部分连接起来） we didn't win the football match／we tried our best

（用 although 或 unless 将句子的两部分连接起来） he was ill／he went to school on time

（用 although 或 unless 将句子的两部分连接起来） he has been in America for 6 years／he still misses his hometown