We can add -er to some verbs and nouns to make a person. If the spelling is vowel + consonant + vowel, you must double the last letter before adding -er. win - winner. If the word already ends in e, add -r.

Explanation of Adding '-er' to form Nouns:

To create a noun referring to a person who performs an action or is associated with a noun, we often add the suffix -er to verbs or nouns.

Rules:

• Standard Addition: For most verbs and nouns, simply add -er. For example, teach becomes teacher.
• Vowel + Consonant + Vowel Spelling: If the base word follows a vowel + consonant + vowel pattern at the end (e.g., run), you must double the last consonant before adding -er. For example, run becomes runner.
• Words Ending in 'e': If the base word already ends in the letter e, you simply add -r. For example, dance becomes dancer.

Example from text: win becomes winner (following the Vowel + Consonant + Vowel rule, where 'n' is doubled).