As long as, so long as, only if, on (the) condition that, providing (that) 和 provided (that) 都是連接詞,用來引導對某一情況施加特定條件或設定限制的條件句。它們可謂同義詞,意為「只要」,但用法不盡相同。As long as 和 providing (that) 比較常用於口說,而 so long as, only if, on (the) condition that 和 provided (that) 則比較正式且比較常用於書寫。例如:
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