I didn t know what was happening outside这句话中为什么happen加ing?

I didn’t know I didn't know what was up?（同义句）I didn't know what （ ）（ I didn't know what （ ）（ 两种 翻译 You didn't know what I was gonna say. I didn't know how to do? I didn't know what to do? I didn't know that I do?这三句有什么区别啊? I didn't know what to do 与I didn't know how to do有什么区别 I Didn't Know 歌词 I didn't kow what to do.[同义句】=I didn't know what ___ ___　＿＿． I didn't know what I should say 用 what to do 替换 What a surprise.I _____ know you ____ here in Wuhan?A.don't know,are B didn't know,wereC.didn't know,are I don't know what you said还是don't改didn't? I didn't know ( ) A.what matter was; B.what was matter 此题选哪项 再问一个 I didn·t know what was happening.同义句 I didn·t know what was —— ——. I was scared and didn’t know what to do.改为同义句I was ()()() and didn’t know what()()do. I didn't know I was cheating. i didn't know what should say to my teacherI didn't know what I should say to my teacher.=I didn't know ____ ____ ____ to my teacher. I didn't know what could I said这句有错么 “I didn't know what I should do”改为简单句 I didn`t know that what would happen.这句话有语法错误吗?