华慧考博-考博英语两个复杂句子的结构分析(二十八)

1. Difficult as it is to track the precise effects of parental upbringing, it may be harder to measure the exact influence of the peer group in childhood and adolescence.

【结构分析】句子的主干为：it may be harder to measure the exact influence of the peer group，其中it为形式主语，而真正的主语是不定式“to measure the exact influence of the peer group”；“in childhood and adolescence”为时间状语；“Difficult as it is to track the precise effects of parental upbringing”为as引导的让步状语。

2. Once we have formulated clear ideas on what thought is in biological creatures, it will be easier to discuss the question of thought in artifacts.

【结构分析】句子的主干为：it will be easier to discuss the question of thought in artifacts，这里it为形式主语，而真正的主语是不定式“to discuss the question of thought in artifacts”；“Once we have formulated clear ideas on what thought is in biological creatures”为once引导的条件状语，其中“on what thought is in biological creatures”相当于介词短语充当“clear ideas”的后置定语。