Question

i knew she was joking中was是什么成份，knew不是谓语么

i knew she was joking中was是什么成份，knew不是谓语么

Answer 1

knew是know的过去式，这涉及到高中知识宾语从句。 I knew是主句，后面的句子是宾语从句，因为在 she was joking中，主she 谓was 宾joking（joking动名词作宾语）都齐全，所以这里省去了knew后面的that，that是引导词，was在从句中作宾语。