What are examples of infinitive verbs?

to read, to destroy, to watch, etc.

Infinitive are verbs which haven't been changed or conjugated for tense, mood, person and so on. They are known as the 'dictionary forms' of the verb, because they are what show up in the dictionary, e.g. to run instead of runs.

In English, infinitives begin with to..., such as

to be

to have

to own

to steal

to speak

to see

to understand