Tell Helen,if she is at home,that i will come to see her.为什么这句中要加that?
问题描述：
Tell Helen,if she is at home,that i will come to see her.为什么这句中要加that?
答
tell sb that 从句，告诉某人什么事，中间if 条件状语是插入语
答
Tell Helen that i will come to see her if she is at home。
tell sb sth ,sth是一个由that 引导的宾语从句。后面是if 引导的状语从句。
答
这个相当于是宾语从句.
tell sb.sth.(sth.用以that 引导的从句代替）
答
if she is at home, tell helen that i will come to see here，
这样看就清楚了吧？