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1. Not long ago, I stood on a corner near my home and watched as some of the 42,000 men, women and children participating in Boston’s Walk for Hunger strode by.
【结构分析】句子的主干为“I stood and watched”；“Not long ago”为时间状语；“on a corner near my home”为地点状语。“as some of the 42,000 men, women and children participating in Boston’s Walk for Hunger strode by”为as引导的伴随状语，其中“participating in Boston’s Walk for Hunger”为分词短语作“the 42,000 men, women and children”的后置定语。
2. Britain in recent decades has been flooded with immigrants from former colonies, which led to an increase in ethnic tensions in the country.
【结构分析】句子的主干为“Britain has been flooded with immigrants”；“in recent decades”为时间状语；“from former colonies”为介词短语作“immigrants”的后置定语；“which led to an increase in ethnic tensions in the country”为which引导的非限制性定语从句对前
【结构分析】句子的主干为“I stood and watched”；“Not long ago”为时间状语；“on a corner near my home”为地点状语。“as some of the 42,000 men, women and children participating in Boston’s Walk for Hunger strode by”为as引导的伴随状语，其中“participating in Boston’s Walk for Hunger”为分词短语作“the 42,000 men, women and children”的后置定语。
2. Britain in recent decades has been flooded with immigrants from former colonies, which led to an increase in ethnic tensions in the country.
【结构分析】句子的主干为“Britain has been flooded with immigrants”；“in recent decades”为时间状语；“from former colonies”为介词短语作“immigrants”的后置定语；“which led to an increase in ethnic tensions in the country”为which引导的非限制性定语从句对前
