前一个直到,才,(动作结束)后一个是直到,才,(开始)
比如he do his homework until 9 p.m做作业做到晚上9点
he did not do his homework until 9p.m
他直到晚上9点才做作业
至于倒装,是not until提前,一般语序不提前意思It was until sb did that ……就行了？没看懂你想说啥没看懂你想说啥It was not until his father came back that he started doing his homework
没错吧没错，