Question

what about when I want to introduce myself?这个句子怎么分析

Answer 1

What about when I want to introduce myself.
意思是：
当我想自己介绍自己的时候会怎么样呢.
句子分析：

What about 主语从句；when I want to introduce myself.状语从句。

what about = what is about。
主语从句，即在复合句中充当主语成分的句子，例如"That he finished writing the composition in such a short time surprised us all"，他在很短的时间内写完作文让我们都很惊讶，此复合句主要描述的是某事让我们惊讶，某事就是该复合句的主语，因此“That he finished writing the composition in such a short time”便是该复合句的主语从句。
引导主语从句的连词主要有：
从属连词：that whether
连接代词：whom whose who whoever what whatever which whichever
连接副词：why when whenever where wherever how however

Answer 2

What about when I want to introduce myself.
意思是：
当我想自己介绍自己的时候会怎么样呢.
句子分析：

What about 主语从句；when I want to introduce myself.状语从句。

what about = what is about。