What are some words that drop f and add ves?

You're thinking about the pluralization of words ending in -f or -fe. The rule is that you generally:

* Drop the -f and add -ves if the word ends in -f or -fe preceded by a consonant:

* leaf - leaves

* knife - knives

* wife - wives

* wolf - wolves

* shelf - shelves

* Add -s normally if the word ends in -f or -fe preceded by a vowel:

* roof - roofs

* chief - chiefs

* belief - beliefs

There are some exceptions to this rule, so it's helpful to familiarize yourself with them.

Here are some examples of words that drop the -f and add -ves:

* calf - calves

* half - halves

* life - lives

* loaf - loaves

* self - selves

* thief - thieves

* wharf - wharves

* scarf - scarves

* dwarf - dwarves

Note: Words like "hoof" and "roof" follow the general rule and simply add -s to form the plural.