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as long as和so long as引導條件狀語從句的區(qū)別

as long as 和 so long as 均可表示“只要”，用于引導條件狀語從句，兩者沒什么區(qū)別。如：

I don’t care so [as] long as she lets me be with her son. 只要她讓我和她兒子在一起，我不在乎。

You can take my car as [so] long as you drive carefully. 你可以用我的汽車，只要你小心點兒開。

You may use my dictionary as [so] long as you don’t keep it too long. 只要使用時間不太長，你可以用我的詞典。

但是，當 as long as 用于本義表示“與……一樣長”時，與 so long as 在用法上是有區(qū)別的，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 took three times as long as I had expected. 這件事比我預料的多花了兩倍的時間。

It didn’t take as [so] long as I expected. 花的時間比我預料的短。