What is wouldn't:couldn"t::green:???????
preen?
To determine the analogy, we need to understand the relationship between the words in the first pair, "wouldn't: couldn't." "Wouldn't" is the contraction of "would not," and "couldn't" is the contraction of "could not." Both words consist of the word "not" added to the auxiliary verbs "would" and "could," respectively. Therefore, the relationship between "wouldn't" and "couldn't" is that they both involve negation by adding "not" to auxiliary verbs.
Applying the same relationship to the second pair, we look for a word that involves negation by adding "not" to another word. In this case, the word we are looking for is "ungreen," because adding "not" after "green" makes it the opposite of being green. "Ungreen" is not a commonly used word, but it can be understood in the context of the analogy.
Therefore, the answer to the analogy "wouldn't: couldn't::green:?" would be "ungreen."