名词性从句中表语从句的that做什么成分,比如the trouble is that the boy is little

Question

名词性从句中表语从句的that做什么成分,比如the trouble is that the boy is little

Answer 1

表语从句：从句充当表语.that一般是起引导作用,不在从句中充当成分.
比如the trouble is that the boy is little.that后边的意义的完整的,that只是其引导作用.
若为其他疑问词,那就一般要在从句中充当成分了.如 The question is what we can eat.此表语从句中,what既起连接作用,也在从句中做宾语.
不懂追问~