加上將即可，will

1.By the time you reach the station, the train will have left.

2.I will have eaten up my meal before she comes back.

3.By the end of next month, he will have traveled 1000 miles on foot.

4.By the time he comes back, I will have finished my homework.

5.They will have come back this time next year.

6.He will have learned ten thousand words by the end of this year.

7.I will have worked in this school for 5 years by the end of this month.

8.They will have found the secret by the time you come back home.

9.By the time tomorrow you will have got the answer.