将来完成时的分类有哪些

英语自学网

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        将来完成时：
        1.构成：shall / will have + 过去分词
        2.功能：表示将来某时之前已经完成的动作。
        →They will have been here for 5 years next Friday.
        →By the end of next term, the students will have finished the book.
         
        过去将来完成时：
        1.构成：would / should have + 过去分词
        2.功能：表示从过去某个时间看将来某时之前已经完成的动作。
        →He said that they would have arrived by seven o'clock.
         
        将来完成进行时：
        1.构成：shall / will have been + 现在分词
        2.功能：表示某一动作将继续到将来某时，且该动作此时尚未发生。
        →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.
        注：此句型过于复杂，人们很少运用，了解而已。