Perfect Infinitive

Perfect infinitive paling sering ditemukan dalam kalimat type 3 conditional sebagai bagian dari conditional perfect meskipun juga dapat digunakan di tempat-tempat lain. Perfect infinitive dibentuk dari:
to have + past participle

Sama seperti present infinitive, ada situasi-situasi di mana bentuk zero dari perfect infinitive harus digunakan, sehingga kata to dihilangkan. Hal ini dilakukan setelah penggunaan sebagian besar modal auxiliary atau tempat lain yang menggunakan zero infinitive.

Contoh
  • He pretended to have seen the film.
  • Before I turn 40, I want to have written a book.
  • I would like to have been to the Taj Mahal when I was in India.
  • If I had known you were coming I would have baked a cake.
  • Someone must have broken the window and climbed in.
  • That man may have noticed the bank robbers' getaway car.