Questions about Capitalization:
Q: Why is it Hablo español and NOT Hablo Español?
Spanish does not capitalize nationalities or names of languages, unlike English.
Q: Why is it Paul llegó el jueves and NOT Paul llegó el Jueves?
Days of the week are not capitalized in Spanish, unlike in English.
Q: Why is it Joseph piensa que yo soy inteligente and NOT Joseph piensa que Yo soy inteligente?
The word yo is only capitalized at the beginning of sentence in Spanish.