1,I don't want to go to school里边儿,to go to school 是要want 的宾语,属于动词不定式做宾语这个语法现象.
2,I don't know what to do就是另外一个语法现象啦.what to do是一句话了,相当于是what I should do一类,视为一个完整的句子.那这个语法现象就是v(动词）+宾语从句了.在宾语从句中,疑问词前置.i don't know where to go,I don't know who to believe...这类的吧,也可以补全为 ：i don't know where I should go to ,I don't know who i can believe,