Question

we will have left the house by monday​

Answer 1

Answer:

On Monday the house will be left by us

Answer 2

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They had left the house a week ago. The past perfect tense is used to denote an action that has taken place in the past at a specific period of time.

In other words, the past perfect tense represents the past relative to timing or other past events.

It is often used for demonstrating things that has happened or were said. It is formed by adding had with the past participle of the verb.