时间、原因、条件与让步状语从句

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"Although he was tired, he kept working." "I'll help you if I can." "Since you're here, let's start." 这些句子都包含状语从句——它们分别表达让步、条件和原因。状语从句让句子之间的逻辑关系更加精确。

“想一想：when 和 while 都表示"当...时候"，但用法不同。"When I arrived, he was leaving" 和 "While I was reading, the phone rang" 中，两个词能互换吗？”