59 將來完成進行時的用法　Track 059

59 將來完成進行時的用法　Track 059
將來完成進行時的用法與現(xiàn)在完成進行時的用法基本相同，只是將“坐標時間”移到將來。同樣是強調(diào)動作的持續(xù)性，表示開始于將來某個時刻之前的動作持續(xù)到將來這一時刻，并可能繼續(xù)持續(xù)下去。
（1）強調(diào)在將來的某一時刻之前一直在持續(xù)的一項活動

 
例句
a. My brother has promised to help me study for my exam tomorrow.I get home from school at 3:00 and he gets home from school at 5:00. I will have been studying for two hours by the time he gets home.
（到5:00，studying的活動仍將持續(xù)）
b. I’m retiring this fall. By then I’ll have been teaching for 30 years.
（到今年秋天，teaching的活動不再持續(xù)）
c. She will have been taking care of her blind husband for 20 years by then.
（taking care of的活動可能還會持續(xù)）
d. I’m getting tired of sitting in the car. Do you realize that by the time we arrive in Beijing, we will have been driving for twenty straight hours?
（2）表示在將來某個時刻之前經(jīng)常重復的動作
例句
a. I will have been attending Professor Smith’s lectures for half a year by next week.
b. By tomorrow I will have been doing morning exercises for 100 days.
c. The old man will have been getting up at 4:00 for ten years by next month.
到下個月，這位老人堅持早晨4:00起床的習慣就保持10年時間了。