срочно, английский язык

1.By the time my son has already finished school.
2.Do not worry, I will find a solution to the problem by tomorrow.
3.we have already translated this text.
4.Dad has already returned from work.
5.By the beginning of June we passed all the exams.
6.I'm sure that we will finish work by next week.
Всё 2 незнаю