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求一个英语知识要点例题:He won't leave for Beijing until________(finish)

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求一个英语知识要点
例题:He won't leave for Beijing until________(finish)that work next week.
然后简单的教一下not...until 句型的用法及时态区别.谢
not...until...”是“直到……才……”
“until”后接时间状语.
实例]
1.Don't tell him the bad news until he finishes his exam.
等他考试完了再告诉他这个坏消息.
2.The secret was not discovered until he was dead.
直到他死后这个秘密才被人发现.
3.I won't stop shouting until you let me go.
你让我走我才停止叫喊.
再问: 也就是说。until前是过去式那么until后也是过去式,until前是将来时until后就用一般现在时,对吗?
再答: en