6. We (drive) more than four hundred miles, by the time we get to Astana this evening. 7. When Asel goes on vacation next month, she (study) German for over two years.
8. He (be) in the Grand Canyon by the time he leaves the United States.
9. By the time you stop studying the verb tense tutorial, you (master) all twelve tenses including their passive forms.
10. I (work) for 20 hours when you call me at breakfast time tomorrow