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(2)When和as一样都是连词，注意它们的不同。如when\当……的时候\
I stayed till sunset, when it began to rain. 我一直呆到太阳下山，那时天开始下雨了。 (3)while是\当……时候；和……同时\
While I was watching TV, he was reading. 当我在看电视的时候，他正在看书。 While there is life, there is hope. 有生命就有希望。
48. so that..../ so... that....
(1) so that....为了，以便 。引导一个目的状语从句，也可引导一个结果状语从句。如： I left at 5:00 so that I could catch the early bus.
He didn't study English so that he lost a chance to work in a foreign company. (2) so... that....既可引导一个结果状语从句，也可引导一个目的状语从句。 The classroom was so noisy that I could hardly study.
I got up so early in the morning that I could catch the train.