until只用于时间之前 有from...until结构 例 they worked from five until ten.
until常常和否定意义的动词连用，以表示强调时间晚了
例we donot get home until 2a.m.
until也常用做时间连词 we will stay here until it stops raining.
为了表示强调就放在句首，这时后面应跟动词的倒装形式
例 until he got home did he realiza that he had lost it.