as long as和so long as引导条件状语从句的区别

　　I don't care² so [as] long as she lets me be with her son. 只要她让我和她儿子在一起，我不在乎。

　　You can take my car as [so] long as you drive carefully³. 你可以用我的汽车，只要你小心点儿开。

　　You may use my dictionary⁴ as [so] long as you don't keep it too long. 只要使用时间不太长，你可以用我的词典。

　　但是，当 as long as 用于本义表示“与……一样长”时，与 so long as 在用法上是有区别的，即 as long as 可用于肯定句或否定句，而 so long as 只用于否定句，不用于肯定句。如：

　　It took⁵ three times as long as I had⁶ expected⁷. 这件事比我预料的多花了两倍的时间。

　　It didn't take as [so] long as I expected. 花的时间比我预料的短。

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