Final answer:
Suffixes like '-ed' indicate completed actions in the past, while '-es' and '-ies' form plural nouns or third person singular verbs. Correctly using these suffixes is crucial for word formation in English grammar.
Step-by-step explanation:
Understanding Suffixes in English
The question posed involves understanding and identifying suffixes, which are groups of letters added to the end of a word to change its meaning or its grammatical function. For instance, the suffix -ed is typically used to indicate the past tense of a verb, suggesting that an action has been completed. Words like dignify, satisfy, and terrify would become dignified, satisfied, and terrified when this suffix is added, indicating actions completed in the past.
Suffixes such as -es and -ies are used to form plural nouns or third person singular verbs in English. For example, sky becomes skies and ally becomes allies to denote more than one, or to conform to the third person singular form in verbs.
An understanding of suffixes is essential for correct word formation and is a key component of English grammar and vocabulary development. Spotting suffix patterns helps with both comprehension and spelling of English words.