题目内容
19．不要把今天的事留到明天去做． （not…until）Don't leave today's work till tomorrow．
分析 Don't leave today's work till tomorrow．
解答 答案：Don't leave today's work till tomorrow．主句是不要把今天的事情留下，是一个否定祈使句，用don't+动词原形leave留下，后加上today's work今天的事情，直到昨天用till表示直到，后加时间状语tomorrow，故答案是Don't leave today's work till tomorrow．
点评 until和till两者都可作介词、连词，一般情况下可以互换使用．用于肯定句时，主句的动词只用延续性的，它所表示的动作一直延续到till或until表示的时间为止，意为"直到…为止"；用于否定句时，主句的动词一般是非延续性的，也可以是延续性的，它所表示的动作直到till或until所表示的时间才发生，意为"直到…（才）"．如：
She watched TV until/till her mother came back．
她看电视直到她母亲回来．（看电视的动作延续到母亲回来才结束）
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