Which of the following types of words must be capitalized?

a The first and last word of every sentence
b First, last, and main words in a book title
c All pronouns that are used in dialogue
d I, only at the beginning of a sentence


Which of the following sentences contains a capitalization error?

a We rented a beach tent so we could rest out of the sun.
b The ice cream truck didn't stop by my house this week.
c Nadia wished that i had not missed her birthday party.
d Soon the tide will come in and all of us can try surfing.