what three things do teachers do to singal that information they are present

问题描述:

what three things do teachers do to singal that information they are present
给充分分析下这个句子的结构和意思
what three things do teachers do
给分析下前面....的结构

你的present后面是不是少了ing啊?也没有singal这个词啊,是signal吧?what three things/do teachers do/to singal that information/they are presenting.分开来讲就是,哪三件事/老师们会做/为了标记出信息/他们在展...