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2013英语四级考试语法目的状语从句
目的状语从句
可以由that, so that, in order that, lest, for fear that, in case等词引导;
lest：以防;从句中的谓语动词必须用should+动词原形;
eg: He wrote the name down for fear that(lest) he should forget it.
He took the umbrella with him lest it should rain.
in case：以防;与lest不同，从句里的时态不做特殊变化;
eg：Take the umbrella with you in case it rains.
for feat that：和lest保持一致;
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