Ⅰ.by“到… …之前”“不迟于”仅指动作发生在限定时间之内或到某一时间为止。如:
①Can you repair my watch by Friday? 你能在星期五之前把表修好吗?(句中时间最迟到星期五,动词可以是瞬间的,也可以是持续的)
Ⅱ.till/untill“直到”强调动作的持续状态,直到将来的某一时刻为止。如:
I shall go on working till/untill next Monday. (此种情况只能用于肯定句中动词必须是延续的)
当untill与not连用时,意为“直到… …才”,主句谓语动词必须是非延续性的。如:
I don’t go to bed untill/till you come.
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