Question

Now I know why the chief had to pretend, not to notice me. (pick out the infinitives)
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Answer 1

Answer:

make a meaningful sentence using following phrase out of the blue

Answer 2

To pretend. To notice.

An infinitive is a word that is generated from a verb but does not function like a verb. It is made up of two words: to + verb, and it functions as a noun, adjective, or adverb. These two words can be used as a noun, adjective, or adverb when used together. Verbals are words that are generated from verbs but do not function as verbs.