li didn't know(what to do)为什么how to do it后要加it,这个却没有?

li didn't know(what to do)为什么how to do it后要加it,这个却没有? 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. Mosr of them didn't know what the teacher m____. he didn't know what to do .反义文句 my mother didn't,know《C what to do it We didn't know what we should do next.We didn't know what __ __ next He didn't know what to do next.He didn't know what he ____ ____ next. My brother didn't know what he should say.(改为同义句)My brother didn't know what _____ _____. l didn't know what to say中didn't为什么用过去式 I didn’t know 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? 有几道英语题不会,可以教教吗?1I don't know what __ (say) at the party.2She didn't know how she should get on with her classmates.() She didn't know __ __ __ on with her classmates.3除了李雷之外我们都到齐了． __ __ here __ Li ''What is happening ouside?'' (用she didn't know作主语） She didn't know ___ ___ ____ outside. we didn't know what we should do next.(改为同义句）we didn't know()()next两空 改为复合句：The little girl didn't know what to do nextThe little girl didn't know()()()do next His friend didn't know what he should do改同义句His friend didn't know（ ）（ ）（ ） I didn't know what to do 与I didn't know how to do有什么区别