Could you give me examples of words ending in that need only a added to make them plural?

You're looking for words that end in "s" but form their plural by adding "es" instead. Here are some examples:

* Bus: Buses

* Box: Boxes

* Kiss: Kisses

* Glass: Glasses

* Dress: Dresses

* Brush: Brushes

* Wish: Wishes

* Tax: Taxes

* Fix: Fixes

* Mix: Mixes