I knowing it is not easy?还是I know it is not easy?

I knowing it is not easy?还是I know it is not easy? 九年级作文I know it is not easy to learn english ,but I have some I think Maths is not easy ,but it's I like flying kites.It is ( ) hard easy not hard It is not easy ______. it is not easy ______ It is easy to climb the hill 和 I found it not easy to get on I know it is not easy for you to achieve.这句后面要不要加it 为什么 it is not easy.这句话应该怎么问 why is it not easy?还是 why isn't it e It is a d____(not easy) question ,I can‘t answer it. Why not t--------- again,it is easy. it is not that easy 中文是什么?