请问老师：
The first thing Jane did was to lose weight.
这里为何was后面要加to呢，能请老师剖析一下这个句子的成分吗？
我写如此的句子习惯不加。加不加都对。主语里包括定语从句Jane did 系动词接不定式做表语。
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请问老师：
The first thing Jane did was to lose weight.
这里为何was后面要加to呢，能请老师剖析一下这个句子的成分吗？
我写如此的句子习惯不加。加不加都对。主语里包括定语从句Jane did 系动词接不定式做表语。
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在英语学习的道路上，句子成分的理解是必不可少的一环。好似建筑中的砖瓦，每一个句子成分都承载着特定的意义和功能，一同构建出完整、准确的语句。
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