This was the first time that I had done sth.帮我分析下

This was the first time that I had done sth.帮我分析下

This was the first time that I had done sth.
that前面都是状语从句修饰done sth.
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你想要怎么个分析法追问that在从句里做什么成分？追答就是一个连词而已

补语从句，that以后是补语，that以前是一个简单的过去式主谓宾结构追问that在从句里做什么成分？追答that在这里没有意义，只是起一个标志作用，可以去掉的

this主语，was谓语，the first time宾语，后面定语追问that在从句里做什么成分？追答引导从句追问不是，比如说在从句做主语宾语那些

定语从句： 关系词 that 引导的句子 I had done sth. 修饰主句里的 the first time追问that在从句里做什么成分？追答关系付词，作状语

主句：This was the first time. 从句：that I had done sth.这是定语从句，修饰time。
译文：这是我头一回儿办好了某事。追问that在从句里做什么成分？追答that，在此句中只是做了引导词，连接被修饰的名词和后面的从句，没有实际的意思。这个that也是可以省略的。