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 PE 为啥用doing I am doing well. I am not doing well in PE.与 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 shit I am not doing shit I am doing very well 是什么意思? I am doing well in school.中的doing是什么意思 i am not feeling well对not feeling well提问 I am not feeling_____.good还是well? Well,I am not feeling myself today? I am not ___(free) very well I am not doing well in ( ).My friend ,Nancy( )better than me.A.drawing ;draws B.draw;draw C.draws; Are you well? No I am not I am（ ） do well in 请问;I am not doing well in PE.与The girl doesn't do well in maths.有什么区别吗,not 后面应该是跟do well in 还是doing well in啊,那don't后面又应该是跟do well in 还是doing well in呢? I am doing well in school.中am是什么,是谓语吗? i am not feeling well 还是good 三克油.么么哒 I am not felling very well.I____to see the doctor.