Although I am poor I am happy. That looks like my lost earring. Formal diction is the language of orations and serious essays. The informal diction of everyday speech or conversational writing can, at its extreme, become slang. In writing, direct dis- course is put in quotation marks.
Indirect discourse gives the meaning of the speech rather than the actual words.
With verbs, only the third person singular has a distinctive form. The most common kind is the prepositional phrase a unit comprising preposition plus object. Nouns, pronouns, and verbs all have plural forms. It should not be set off by commas. The end of a sentence is marked by a period.