1、,20120324 unless,unless,unless- if not You will fail in English unless you work harder.Unless your team improves your game ,you are going to lose the match.We should never try to revive a person unless we know how to do it.,一般情况下unless- if not 的用法是相同的。都可以引导条件状语从句。 但是 unless不能指尚未发生的事情的结果，因而不可用于引导非真实条
2、件句； unless可用来对刚说过的话加以补充，此时不能用if .not 替换。,1.We would have had a lovely holidayif it had not rained.2.I havent got any hobbies unless you call watching TV a hobby.,unless EX. _ there is a snowstorm or some other bad weather, the mail always comes on time.A.Because B.If C.When D.Unless,You will improve your oral English if you keep on practising He will never make progress _he works hardA. if B. unless If I _you, I would give up smoking at onceA. was B. am C. is D. were,
