How does the infinitive function in the sentence?

Infinitives can be used as nouns, adjectives, or adverbs. An infinitive will almost always begin with to. Exceptions do occur, however. An infinitive will lose its to when it follows certain verbs. These verbs are feel, hear, help, let, make, see, and watch.

1. she did not cheat on the test, for it was the wrong thing to do.2. i am counting my calories, yet i really want desert.3. i really need to go to work, but i am too sick to drive. there 3 examples of a compound sentence good luck