什么是perfect infinitive,gerunds还有participles

THE PERFECT INFINITIVE
A Form
to have + past participle: to have worked, to have spoken
В -- Use with auxiliary verbs
1/ With was/were to express an unfulfilled plan or arrangement (see 114):
The house was to have been ready today, (but it isn't)
2/ With should, would, might and could to form the perfect conditional
If 1 had seen her I should have invited her.
3/ With should or ought to express unfulfilled obligation; or, in the negative, a wrong or foolish action
He should have helped her. (but he didn't)
I shouldn't/oughtn't to have lied to him. (but I did)
4/ With should/would like to express an unfulfilled wish:
He would like to have seen it. (but it wasn't possible) or
He would have liked to see it.
i.e. we can put either verb into the perfect infinitive without changing the meaning.
5/ With could to express past unused ability or past possibility:
/ could have made a lot of mone