Perfect Infinitive (ham Active, ham Passive) quyidagi hollarda ishlatiladi:
1. Perfect Infinitive gapning kesimidagi fe’l ifodalagan ish-harakatdan oldin sodir bo‘lgan ish-harakatni ifodalaydi:
He seems to have finished his work. U ishini tugatganga o‘xshaydi.
This writer is said to have written a new novel. Aytishlaricha bu yozuvchi yangi roman yozgan.
2. may va must fe’llaridan keyin kelib ish-harakat allaqachon sodir bo‘lgan degan taxminni ifodalash uchun:
He must have fogotten about it. U buni unutgan bo‘lishi kerak.
I don’t know where he is. He may have gone to London.
Uning qayerdaligini bilmayman. Londonga ketgan bo‘lishi mumkin.
3. should, would, could, might, ought to, va was (were) to modal fe’llaridan keyin kelib bajarilishi lozim bo‘lgan va bajarilishi mumkin bo‘lgan, lekin haqiqatda bajarilmagan ish-harakatni ifodalaydi:
He should (ought to) have gone there. U o‘sha yoqqa ketgan bo‘lishi kerak edi.
You could have helped him. Siz unga yordam bera olardingiz.
He was to have come yesterday. U kecha kelishi kerak edi.
4. to intend, to hope, to expect, to mean fe’llarining o‘tgan zamondagi shaklidan keyin kelib ish-harakatni sodir qilishga qasd, umid bo‘lishiga, shu ish-harakatni sodir etilishini kutishga qaramay shu ish-harakat sodir bo‘lmaganligini bildiradi:
I intended to have finished my work last night.
Men kecha oqshom ishimni tugatishga qasd qilgan edim (tugata olmadim).
I hoped to have met him there. Men uni o‘sha yerda uchratishni umid qilgan edim (uchratmadim).
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