（时态分享15）将来完成时(will have done)

①表示一个动作到将来某个时间为止已经完成，强调对将来那个时间产生的影响。

例：Pick me up at 8 o'clock,I will have had breakfast by then.

早上8点钟你来接我,到时我已经吃完早饭了.

②表示一个动作延续到将来某个时间，并且有可能继续延续下去。

例：The conference will have lasted a full week by the time it ends.

会议从开始到结束将持续整整一个星期。