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| 将来完成时 will/shall have + done | By the end of next year,they will have finishd work on the new stadium.到将来某一点时间为止, 某个动作已经发生 |
|---|---|
| 现在完成时 have/has + done | I have just received a letter from my brother, Tim. 到现在某一点时间为止过去完成式，到过去某一点时间为止 |
一般将来时 除了可以用来预言将来发生的事以外，还可以表示“意愿”，如允诺、建议、请求、提议等。
- The radio hasn’t been mended yet. Never mind! I’ll mend it for you. （允诺）
- Will you open the door for me please! （请求）
- Shall we go for a swim tomorrow? （建议）
将来进行时 除了表示最近或不久的将来正在进行的动作外，还可以表示计划或安排好的事。
- A great many people will be visiting the country.
- Will you be spending your holidays abroad this year?
将来完成时 常与by 和 not…till/until+表示时间的名词连用(用于表示到将来某一时刻已经完成的动作。)
- I hope they’ll have finished it in time for the journey.
- I expect you will have changed your mind by tomorrow.
- I will have finished it until/till tomorrow.