以下是小編給大家整理的將來完成時主要用法歸納和分類，，希望可以幫到大家
將來完成時的用法<一>
1. 表示將來完成
即表示到將來某個時間為止勢必會完成或預(yù)計要完成的動作。如：
Maybe by then you will have changed your mind. 也許到時候你已經(jīng)改變主意了。
“You'll have finished by tomorrow.” “I wish!” “你到明天就完成了。”“但愿如此! ”
I hope I'll have finished the work by the end of the month. 我希望我這個月底能完成工作。
Demand for cars in the developed world will have reached saturation point within 20 years. 不出20年，已發(fā)展國家的汽車需求將達到飽和。
Planning so far ahead makes no sense—so many things will have changed by next year. 提前這么久就計劃并不明智——到明年，許多事情都會發(fā)生變化。
2. 表示動詞的持續(xù)
即表示某種狀況將一直持續(xù)到說話人所提及某一將來時間。如：
We will have been married a year on June 25th 到6月25日我們倆結(jié)婚就滿1年了。
By this time next week, I will have worked for this company for 24 years. 到下星期此刻，我已經(jīng)為該公司干了24年了。
3. 表示推測
即表示根據(jù)某情況作出的推測。如：
That will have been Roland. He said he'd be back at 7. 準是羅蘭，他說他7點鐘回來。
There will have been a definite result before Friday. 星期五以前將肯定會有結(jié)果。
將來完成時的分類<二>
將來完成時：
1.構(gòu)成：shall / will have + 過去分詞
2.功能：表示將來某時之前已經(jīng)完成的動作。
→They will have been here for 5 years next Friday.
→By the end of next term, the students will have finished the book.
過去將來完成時：
1.構(gòu)成：would / should have + 過去分詞
2.功能：表示從過去某個時間看將來某時之前已經(jīng)完成的動作。
→He said that they would have arrived by seven o'clock.
將來完成進行時：
1.構(gòu)成：shall / will have been + 現(xiàn)在分詞
2.功能：表示某一動作將繼續(xù)到將來某時，且該動作此時尚未發(fā)生。
→We shall have been staying here for four weeks when Tom arrives.
→It will have been raining for a week if it does not stop tomorrow.
