Answer - Infinitive
A verb that starts with "to" is in an infinitive verb form. Typically, an infinitive can function as adverbs, adjectives or as nouns; it usually does not function as a verb. Also, an infinitive <span>has no inflection binding it to a particular subject or tense.</span>
His mouth swimming means his mouth was watery
His clowning grin means he was foolish or behaved like a clown
They are referring to when Dr. Rank performed medical tests to see if he was dying or not.
B) The most popular careers in the year 2015.
Mom made a pie for for desert
