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

Example Input: Sentence: 'a man stands on he beach with a surf board'. Count the number of verbs in this sentence.
Example Output: 1

Example Input: Sentence: 'Someone hung a clock from a building not knowing that the numbers were all backward'. Count the number of verbs in this sentence.
Example Output: 2

Example Input: Sentence: 'A young cow looking out through a cage.'. Count the number of verbs in this sentence.
Example Output:
1