1.Bythetimeyoureachthestation,thetrainwillhaveleft.

　　2.Iwillhaveeatenupmymealbeforeshecomesback.

　　3.Bytheendofnextmonth,hewillhavetraveled1000milesonfoot.

　　4.Bythetimehecomesback,Iwillhavefinishedmyhomework.

　　5.Theywillhavecomebackthistimenextyear.

　　6.Hewillhavelearnedtenthousandwordsbytheendofthisyear.

　　7.Iwillhaveworkedinthisschoolfor5yearsbytheendofthismonth.

　　8.Theywillhavefoundthesecretbythetimeyoucomebackhome.

　　9.Bythetimetomorrowyouwillhavegottheanswer.

　　10.Thetrainwillhavereachedtherebythen.

　　11.Perhapswewillhavefinishedourworkbeforeshearrives.

　　12.Whenwegetthere,theywillprobablyhaveleft.

　　13.Wewillhavestudiedwellfortheexambytheendofthemonth.

　　14.Themeetingwillhavealreadystartedbythetimewegetthere.

　　15.I'llhavefinishedmyhomeworkbylunchtime.