The document discusses the modal expressions "would prefer" and "would rather" which are used to talk about preferences in English. Both expressions mean the same thing and are synonyms for the verb "prefer." They can be used to talk about present or future preferences. "Would prefer" can be used with either a noun or verb, while "would rather" can only be used with a verb. The negatives of both expressions use "would prefer/rather not" plus an infinitive verb. Contractions are often used with both expressions when used with pronouns.