Question

he was quick to see the point

( state how the infinitive)​

Answer 1

It is in infinitive as the word "to" is put before the verb .. Whenever "to" is put before any verb it becomes infinite..This was the reason for the above sentence to be infinitive...

Some similar examples include -

to read , to play , to watch , to write . etc...

(in the above examples "to" is put before a verb.)