I am going to do that I want to do 这句话that应该改成what为什么``

I am going to do that I want to do 这句话that应该改成what为什么`` I am going to do what i want to do .中的what 可不可以改成 英语语法.1.I am going to do that I want to do（这句话是否是对的?）如果上面那句是对 I just want to doing things that I want to do.还是应该用what引导? I just want to be more happy,to do that what I am willling t I am going to do what i want to do 的同义句是什么? 这个句子 I am going to do 【what】 you tell me.为什么 句中 不可用 that I'm going to do what I want to do what are we going to do after work?i am thinking that we cou What I am going to do? That's what i was going to do 为什么是Do you want to know what I do?而不是what am do?