帮忙分析英文句子成分, 包含的复杂句等等:

One puzzle fact is that many birds journey much futher than would be necessary just to find food and good weather .
问:much 前怎么不用be 动词了, further than 后面为什么用would be, 求分析。

这个一个表语从句,其中有含有more than句型。much further修饰表语从句的谓语动词,than后面接的是句子,有必要的省略。 补全给你看下
One puzzle fact is that many birds journey much futher than(it) would be necessary( for birds) just to find food and good weather .
一个事实情况令人费解:许多的鸟通常都飞到比必要的觅食和找到好的天气所到的距离更远的地方。
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