Here's why:
* Compound words are formed by combining two or more words. Examples include "sunbeam", "firefly", or "highchair".
* Past tense verbs are formed by adding suffixes (like "-ed", "-d", or "-t") to the base form of the verb, or by changing the spelling of the verb.
Examples:
* Compound word: "Walked" is not a compound word. It's formed by adding "-ed" to the base form "walk".
* Past tense verb, not a compound word: "Ran" is the past tense of "run". There's no combining of two words.
* Past tense verb, not a compound word: "Broke" is the past tense of "break", and it doesn't involve joining two words.
Let me know if you'd like more examples!