一般英语否定句连词是用or,但是为什么‘He couldn't reach it and came back to th

一般英语否定句连词是用or,但是为什么‘He couldn't reach it and came back to th I couldn"t leave before he came back(改为同义句） I _______ leave_ 英语连词成句go,and,relaxed,back,we,or,work,to,prepared,school,to then he came back to china and he flew to beijing 为什么用flew A farmer couldn't read or write.One day he went to a man and He couldn't read or write,为什么不能用and连接两个动词? couldn’t so he tired walk he on be that 英语连词成句 I didn't leave until he came back 同意句转换：It was _____ ______ It wasn't until he came back that I went to bed He couldn't come back today（改同义句） was,Rose,raining,back,when,it,came连词成句 relaxed,and,to,go,back,work,study,or,to,we,prepared（连词成句）