将来完成时的基本结构是：sb will have done sth.标志词有：

1、by+将来时间（时间点），如：by next Tuesday。

如：She'll have finished the work by next Saturday.(她将在下周六之前完成这项工作。)

2、by the end of+将来时间（时间段），如：by the end of next year。

如：She'll have finished the work by the end of next year.（她将在明年年底前完成这项工作。）

3、by the time+从句 (谓语采用一般现在时)，如：by the time he comes back。

如：She'll have finished the work by the time she comes back.（她将在她回来前完成这项工作。）