状语从句的时态特点
状语从句讲解和练习
状语修饰动词、形容词、副词或整个句子。通常由副词、介词短语、动词不定式、分词和从句等担当。例如：
1. Naturally, our grandparents were pleased to get our phone call. (副词)
2. We worked hard, from sunrise to sunset. (介词状短语)
3. To help my disabled aunt, I spend an hour working in her house every day. (不定式)
4. Seen from a distance, the farmhouse looked deserted. (过去分词)
5. I know how to light a camp fire because I had done it before .（原因状语从句）
