An infinitive composes the words "to" plus the "simple verb". Infinitives can be used as nouns, adjectives or even adverbs. In the given sentence above, the part of the sentence that contains an infinitive is, "to enrich". The infinitive "to enrich" is used as an adverb in the sentence modifying the verb
"decided".
D. You don't suppose it's haunted, do you?
You can tell by the use of the word "you" or "you're"
Answer 4 & 5 u can also search on the web