Final answer:
In the sentence 'Lord Farquaad could have gone skiing, but he chose to read a book instead', the word that needs to be changed is 'could'.
Step-by-step explanation:
In the sentence 'Lord Farquaad could have gone skiing, but he chose to read a book instead', the word that needs to be changed is 'could'.
The word 'could' is a modal verb indicating the ability or possibility of doing something. In this sentence, it suggests that Lord Farquaad had the option to go skiing but chose to read instead.
To change the word, you could replace 'could' with another modal verb like 'should' or 'might', or you could use a different verb altogether such as 'wanted' or 'decided'.