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。］

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