In this task, you need to count the number of nouns/verbs in the given sentence.

Example Input: Sentence: 'a small group of fish about to be cleaned'. Count the number of verbs in this sentence.
Example Output: 1

Example Input: Sentence: 'A parked blue bike with a red umbrella buckled on the body'. Count the number of verbs in this sentence.
Example Output: 2

Example Input: Sentence: 'A zebra walking through a grassy open field'. Count the number of verbs in this sentence.
Example Output:
1