posted by R S Telagathoty .
could you explain how to use perfect infinitive correctly in eng language
There's a chart here with basic explanations of different infinitive and gerund forms. Remember that perfect forms use 'have' for the most part :
to have run (the race)
to have taken part in the performance
to + have + [verb form]
This can also be passive: 'to have been chosen'
Be sure to read through other sections, especially the one with the blue button below this.