完了不定詞
完了不定詞は、他の句にも使われますが、条件付完了の一部として仮定法過去完了 に最も頻繁に使われます。完了不定詞の形状：
to have + 完了不定詞
現在不定詞と一緒に使われる場合のように、toなし不定詞を必要とする場合もあり、その場合はto をなくします。これはほとんどの法助動詞の後で起こります。
例
- 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.