... automatically. They have informed already. They have been informed already. These books should returned today. These books should be returned today. The plane delayed by bad weather. The ... bought the tickets. CORRECT: Before we can tell them about the discount, they will have bought the tickets. Part A: Choose the correct answer. By the middle of the twenty-first century, the ... the time we have to make a decision. CORRECT: We will have gotten an answer to our letter by the time we have to make a decision. INCORRECT: Before we can tell them about the discount, they...