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model B:he didn't come back.we were ready to leave.(until)--

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model B:he didn't come back.we were ready to leave.(until)------
he didn't come back until we were readyto leave
1,the teacher didn't begin the lesson.all the students became quiet
2,i couldn't ride a bike.I was sixteen
3,i didn't know about this.he told me last night
………………
until是直到的意思
1 the teacher didn't begin the lesson until all the students became quiet
2 I couldn't ride a bike until I was sixteen
3 I didn't know about this until he told me last night