I know it is not easy for you to achieve.这句后面要不要加it 为什么

I knowing it is not easy?还是I know it is not easy? I know it is not interesting and it is difficult to learn 翻译 谁能帮我改下一篇英语演讲稿?（急用）Good after,ladies and gentlemen.I am glad to stand here.Today,I will talk about friendship. What is friendship? As well-know,it is important between friends.But,how to keep the friendship? It is eas I know it is over what i do not know is that why...是不是应该改为is it that why啊 翻译You know I love you? You do not know what it is? I also would like to. My Angel I not know it 错在哪里? Tom does not know this as I dao .But I will not do it ,It would be wrong ,and I will not do what is wrong i know you like sweet food and it is not good to your teeth.改错 There is something not that i don't know but didn't say it 英语翻译中文I would not know how interesting it trucly is i （ ）know what it is.A,not B,can‘t C,don’t () it is raining or not ,I don't know.括号填if还是whether it is because you did not grasp.Do not know how I said Le.帮忙回答下` 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 LATE TO KNOW IT FOR I do not know if this is a wrong beginning,will it last longer?My heart is so painful是什么意思. I know it is not good for me,but is tastes good!这句话哪里错了