于”。Р如： Since the job is dangerous, let”s do it more carefully.РРР Р Р9. so that 表示目的，意为“以便”。Р如： Speak loud so that everybody can hear clearly. so ... that 表示结果，意为“如此……以至于”。Р如： He got up so late that he missed the bus.Р10. than 表示比拟，意为“比”。如： Things were worse than we thought.Р11. unless 表示条件，意为“除非；假如不”。如： I will go to the zoo unless it rains.Р12. until / till 表示时间，意为“直到……为止”。如： I”ll wait till he comes back.Р13. when表示时间，意为“当……时”。如：When they got there, the train had left.Р14. whether表示让步，意为“不管；无论；是否”。如： Whether she is ill or well, she is always happy.Р15. while 表示时间，意为“当……的时候” 。Р如：While he was in Beijing , he visited the Great Wall. while表示让步，意为“尽管；既然”。Р如： While I find the problems very difficult, I don”t think they are unsoluable.
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