Сравните present simple и present progressive.

Масленица!   грэйт! итс  э  трэдишэнэл  ˈрашэн  ˈфестивэл  колд  ˈпэнкейк  вик.  итс  май  ˈфейвэрит .  ит  ластс  фром  ˈмандей  тил  ˈсандей. ви  и: т  ˈпэнкейкс,  тейк  па: т  ин  зэ  хоровод  энд  бён  э  стро:   дол  зэ  ˈсимбэл  ов  ˈвинтэ. ви вэа  ˈфани  мескс  энд  плей  ˈсноубол  энд  клайм  зэ  поул. ви  сей  гудˈбай  ту  ˈвинтэ   энд  хеˈлоу  ту  сприн

1.by half past eight they (will not have had) supper yet. 2.the birds ( will have flown) away before winter comes. 3.in five years' time we ( will  have finished) school. 4.by this time next week jack ( will have taken) his exam. 5.i hope it ( will have stopped) raining before we have to go. 6.i don't think my parents ( will have bought) a computer by the end of the week. 7.george ( will not have memorized) al the idioms by friday. 8.the rogers (finish) building their new cottage before summer. 9.the party ( will not have started) before we get there. 10.he ( will not have come) back by supper time.