This guide 主语 describes 谓语 what I think life on mars will be like宾语从句. 再分析宾语从句: what是will be like中like的介词宾语. I think 插入语 life on mars 主语 will be like (what)是系表结构,作谓语. 如果我帮到了你, 再问: 解释的非常好,我有个问题 i think是插入语,如果提出来,放在哪个位置呢? 再答: This guide describes what i think life on mars will be like. I think是插入语,如果提出来,可放在: This guide describes what life on mars will be like,I think .