He didn't know what was happening outside,为什么happening是进行时?

He didn't know what to do next.He didn't know what he ____ ____ next. he didn't know what to do .反义文句 He didn't know what he should do.(改为简单句)He didn't know ___ ___ ___. My brother didn't know what he should say.(改为同义句)My brother didn't know what _____ _____. His friend didn't know what he should do改同义句His friend didn't know（ ）（ ）（ ） He still didn't know what he would do nextHe still didn't know___________________________改写句子 不改变意思 it appeared that he didn't know what was happening=he()()to know what was happening He was so foolish that he even didn't know what his teacher was saying He didn't know what is hppenning.是对的 还是He didn't know what hppenning is.是对的 一道初二英语单词填空He didn't know what was h__outside.(是不是用happen?） He didn't know what was happening outside为什么用进行时 He didn't know what was happening outside,为什么happening是进行时? He didn't know -------to do?应该填how还是what?why? I didn’t know what time he __ the letter.(write) I didn’t know what time he _wrote__ the letter.是宾语从句吗 on hearing the bad news,he became f____ and didn't know what to do next. In fact ,he didn't know what danger____(face).‘ 动词填空 we didn't tell him he probably would never make the team,so he didn't know.What's the meaning of make the team.