not放在句首一般表示倒装,比如not until,not before,not XXX than等等
Not until his mother came home did he went to bed.
Not before February will he come back.
not放在句首一般表示倒装,比如not until,not before,not XXX than等等
Not until his mother came home did he went to bed.
Not before February will he come back.