问题补充：
If I forget ,please remind me of it 的简单句划分Metals are such things as iron gold 的划分Don keep this thing within the Peoplesreach.It is no use continuing with us.It is necessary for yours to be reminded
答案：
1.If I forget:条件状语从句
remind ...of ...谓语
me:间接宾语 it:直接宾语
2.Don keep this thing within the Peoplesreach
don keep 谓语
this things:宾语
within the Peoples reach 介词短语作状语
3.It is no use continuing with us.
It :形式主语 no use:表语 continuing with us:真正的主语
4.It is necessary for yours to be reminded of our shortcoming
It :形式主语 for yours (我认为应是for you):逻辑主语
to be reminded of our shortcoming:真正的主语
