Future perfect simple or future perfect continuous? Choose the correct form.
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John _________________ for several hours before he finally goes home.
Jack ________________ for 10 years in our company by the time he retires.
We __________________ for several hours before finally reaching a compromise.
Sarah _______________ code since morning before taking her lunch break.
I’m afraid Jack _________________ his presentation by 4 o’clock.
We _________________ our department by the end of the year.
By September, we ______________ the product for a year.
___________________ the email by three o’clock?