Shedidn'tarriveuntil6o'clock.
Don'tgetoffthebusuntilithasstopped.
Ididn'tmanagetodoituntilyouhadexplainedhow.直到你教我后,我才会做。
1)Until可用于句首,而till通常不用于句首。
Untilyoutoldme,Ihadheardnothingofwhathappened.
2)Untilwhen疑问句中,until要放在句首。
---Untilwhenareyoustaying?你呆到什么时候?
---UntilnextMonday.呆到下周一。
Notuntiltheearlyyearsofthe19thcenturydidmanknowwhatheatis.
NotuntilIbegantoworkdidIrealizehowmuchtimeIhadwasted.