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Apostrophes. Don’t put your apostrophes in places they don’t belong. This is a mistake many writers make that causes English majors far and wide to wail and scream out loud.

Example: At Pizza By Luigi we offer pickup’s and delivery’s.

Sorry, Luigi, this is not correct. The above sentence would be interpreted as: pickup isand delivery is.

It should read: At Pizza By Luigi we offer pickups and deliveries.

Also, when forming the possessive of a singular noun (that does not end in an “s” or an “s” sound), you must add an apostrophe and then an “s”.

Example: Luigi’s pizza is the best in town, even if his grammar isn’t.

If you’re writing the possessive of a plural noun that ends in “s” or “es,” simply place an apostrophe after the last letter.

Example: The customers’ hunger subsided after eating all the pizza.

Hyphens. Quite dashing, the hyphen can be used to create a compound adjective before a noun.

Example: I saw pizza eating children at Luigi’s.

Depending on how you read it, this sentence makes Luigi’s restaurant seem like a dangerous place to take your little ones.

Hyphen to the rescue!: I saw pizza-eating children at Luigi’s.

Now, instead of the mutant pizza munching on children, we have children snacking on pizza. The hyphen lets us know that the words “pizza” and “eating” are working together to describe the children.

There are as many rules of grammar as there are types of pizza (possibly more!)—this is just a taste. But with a little common sense, a handy grammar guide, and a good eraser (or delete button), you should be able to keep grammatical blunders to a minimum.

http://www.huffingtonpost.com/2014/02/05/common-grammar-errors_n_4731279.html