将来完成时的分类
将来完成时的分类：1、将来完成时。构成：shall / will have + 过去分词。功能：表示将来某时之前已经完成的动作。2、过去将来完成时。构成：would / should have + 过去分词。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。
将来完成时的分类：
一、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。
例：They will have been here for 5 years next Friday.
例：By the end of next term, the students will have finished the book.
二、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。
例：He said that they would have arrived by seven o'clock.
三、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。
例：We shall have been staying here for four weeks when Tom arrives.
例：It will have been raining for a week if it does not stop tomorrow.
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