I am not doing well in maths 中的doing为什么要用动名词形式呢?

I am not doing well in maths 中的doing为什么要用动名词形式呢? I am doing well in school.中的doing是什么意思 I am not doing well in PE.与 I am doing well. I am not doing well in ( ).My friend ,Nancy( )better than me do well in 请问;I am not doing well in PE.与The girl doesn't do i am doing well 和 i am doing good 哪个对,为什么,副词修饰动词? I am not doing shit I'm not doing well in PE.（对划线部分提问） 划线部分是not doing well in PE what am i doing为什么这么用 homework Maths am doing I my.books he reading is the the in I am doing very well 是什么意思?