十五．将来完成进行时：shall / will have been + 现在分词
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。］
新概念二册语法十五．将来完成进行时：shall / will have be
2010-08-15语法
