询问初中英语知识点 1.refund是一重音还是二重音 2.sell out sold out...

发布网友发布时间：2024-04-11 01:38

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热心网友时间：2024-04-11 07:33

['ri:fʌnd] 是一重音

: Sold是sell的过去式~~ Sold out 售完(货);全部出售
sold(原形sell)只是普通的卖而已

keep doing / keep on doing
1) 均可表示“继续做某事，反复做某事”，可互换，只是 keep on 更加强调时间的间隔性和动作的反复性，及某人做某事的决心。
He kept on working until midnight though he was tied.
The boy kept /kept on asking some silly questions in class.
2) 若表示一连续不段的动作，或某一动作的持续状态，只宜用keep doing .
She kept waving to her husband until he was out of sight.
They kept standing outside the room during all the meeting.
Keep lying here; I will be back soon.
3) 若表示今后或将来继续做某事，则只宜用keep on doing 。
We must keep on working hard in the coming new year.
He kept on smoking though we advised him to stop to smoke.