Questions & Answers about Quando verranno qui, noi saremo già partiti.
Why is verranno in the future tense when the English translation uses the present tense?
How is the future perfect formed in the phrase saremo partiti?
It is formed by taking the future tense of the helper verb essere (saremo) and adding the past participle of the main verb (partiti). You use essere here because partire (to leave) is a verb of movement, which requires essere as its helper.
Why does the past participle end with an i in partiti instead of an o?
Where does the word già (already) go when using a compound tense like the future perfect?
Just like in the regular past tense, short adverbs like già are usually placed right between the helper verb (saremo) and the past participle (partiti).