The apostrophe (') is used—
1. To show the possessive case of nouns (See [Exercise 82]); as,
The boy's writing is excellent.
2. To indicate the omission of one or more letters; as,
I'll attend to the matter.
3. To show the plural of letters, figures, and words that usually have no plural; as,
Your 3's are too much like your 5's, your a's like your u's.
Don't use so many and's.
Write sentences in each of which you use one of the following words correctly: