①by +表将来的时间点,句子用将来完成时。
By four o’clock tomorrow afternoon,I will have already
finished all the work.
到明天下午4点,我会早已干完所有的活儿了。
②by+表过去的时间点,句子用过去完成时。
By the time he got here,I had already finished all the work.
他到这儿的时候,我已干完了所有的活儿。
(2)将来完成时用于表示到将来某一时间已经完成的动作,结 构:will+have +过去分词。
By 2046,the population there will have risen to over 20 million.
到2046年时,那里的人口将会已经超过两千万。
即学即用
⑳By the time Mother came back from work,I ________ my
homework.
A.finished
B.was finished
C.had finished
D.will finish
By the end of this year,we ________ another two buildings.
A.will build
B.will have built
C.have built
D.will be building
答案:⑳C
B
2.By the year 2030,development in biochemistry and medical
science will have made it theoretically possible for us to live
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