Вопрос, который вызвал трудности

Помогите пожалуйста!!
1.By half past eight they (not,have) supper yet.

2.The birds (fly) away before winter comes.

3.In five years' time we (finish) school.

4.By this time next week Jack (take) his exam.

5.I hope it (stop) raining before we have to go.

6.I don't think my parents (byu) a computer by the end of the week.

7.George (not,memorize) al the idioms by Friday.

8.The Rogers (finish) building their new cottage before summer.

9.The party (not,start) before we get there.

10.He (not,come) back by supper time.

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Чтобы дать полноценный ответ, был привлечён специалист, который хорошо разбирается в теме.

После обсуждения с другими специалистами сервиса мы пришли к выводу, что правильный ответ на ваш вопрос будет звучать следующим образом:

1 will not have 2 will have flown 3 will have finished 4 will have taken 5 Will have stopped 6 will have bought 7 will have not memorised 8 will have finished 9 will not have started 10 will not have come