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On the train I saw a student___I thought was your sister.

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On the train I saw a student___I thought was your sister.
这里横线应该填 who ,别人说I thought是插入语,和形式主语有关系吗?那这个句子中没有形式主语吗?
On the train I saw a student___I thought was your sister.
I thought是插入语,可删去不看,
On the train I saw a student (who was your sister).在火车上,我看到的学生是你姐姐或妹妹.
括号里是一个定语从句,先行词a student 在定语从句中当主语,这个句子没有形式主语.
形式主语通常是以it开头,形式主语it 作为形式主语的it并无实际语义,只是为满足语法上的需要,避免句子头重脚轻,它代替的是句子的逻辑主语,常见的概括起来会有如下情况:
1.不定式作逻辑主语  
如:It is very kind of you to give me a hand in time.你及时帮助我,真是太好了.
2.从句作逻辑主语  如:It so happened that the tickets were sold out.不巧,票都卖光了.