英文语法问题I immediately embarked on an experiment which,even tho

定语从句 + 让步状语从句
1 I immediately embarked on an experiment.(简单句)
2 The experiment kept me fascinated for twenty-four hours even though if failed to get rid of the ants,（让步状语从句-------even though- - - - -）
3 定语从句：I immediately embarked on an experiment which kept me - - - -- .(定语从句：an wxperiment which - - -- - -)

[ "is required" 语法错误] (2) A good teacher not only conveys information [ knowledge 比较适合] learned but also instills in her students a

I immediately embarked on an experiment 是主句，从 which 开始到句末是定语从句。在定语从句里，两个逗号之间是让步状语从句。