What is the relationship between 'watch' and 'watches', and 'fly' and 'flies' as shown in the image?

Grammar Explanation:

The image illustrates a grammatical rule related to verb conjugation in the third-person singular present tense.

• watch → watches: This shows that when the subject is third-person singular (he, she, it), verbs ending in '-ch' typically add '-es' to form the present tense.
• fly → flies: This demonstrates a spelling change where verbs ending in '-y' preceded by a consonant change the 'y' to 'i' and add '-es' in the third-person singular present tense.

Answer: The examples show how verbs change their endings to agree with a third-person singular subject in the present tense. 'Watch' becomes 'watches' and 'fly' becomes 'flies'.