注意if与unless的区别:不能用and连接两个unless从句,即不能有 unless ,and unless .但if not and if not却不受此限.
You wont lose your weight unless you eat less and unless you exercise more.()
但可以说 unless you eat less and exercise more.
10、注意状语从句中从句的省略现象
(1)连接词 + 过去分词
Dont speak until spoken to.
Pressure can be incrased when needed.
Unless repaired, the washing machine is no use.
(2)连词 + 现在分词
Look out while crossing the street.
(3)连词 + 形容词/其他
常见的有it necessary、if possible、when necessary、if any等.
二、精典名题导解
选择填空
1. I dont think Ill need any money but Ill bring some ____________.
A.as last B.in case C.once again D.in time
解析:答案为B.句意为带些钱以防万一,只能选择in case.引导的条件状语从句,后面省略了I should need it.
2. The WTO cant live up to its name _________ it doesnt include a country that is home to one fifth of man-kind.
A.as long as B.while C.if D.even though
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