题目内容
20．直到把工作做完，他们才会回来．Theywon'tbe back until the workisfinished．
分析 won't/； is
解答 答案：won't； is
通过中英文句子的比对，发现英文句子缺少"直到…才"的完整表达；这句话也可以理解为：在工作完成之前，他们将不会回来；结合until可知此句应用固定句型not…until完成；联系语境，此句until引导的时间状语从句时态应遵循主将从现的原则；所以主句指还没有发生的事情用一般将来时will+动词原形，故用will+not缩写为won't；从句用一般现在时，主语为 the work 是谓语动词finish的动作承受者，所以应该用一般现在时的被动语态，构成为am/is/are+过去分词；主语为单数，所以此处应用is．故填：won't； is
点评 此题考查固定句型not…until的用法．做题时联系汉语结合给出的英文部分确定出正确的句型．对此题而言，确定好主从句的时态是关键，还要注意被动语态的正确使用．
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