假如他不同意，我们怎么办？
7.as（so）long as
You may use the room as long as you keep it clean.
只要保持清洁你可以用这个房间。
8.on condition（that）
I’ll lend you the book on condition（that）you return it on Monday.
只要你能在星期一还我，这本书我就借给你。
（八）引导让步状语从句
1.although/though
Everybody worked with great enthusiasm although/though the weather was extremely cold.虽然天气很冷，大家工作得非常起劲。