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

Example Input: Sentence: 'A cat that is laying down on a bed'. Count the number of verbs in this sentence.
Example Output: 1

Example Input: Sentence: 'One person tossing a frisbee to another person in front of some trees'. Count the number of verbs in this sentence.
Example Output: 1

Example Input: Sentence: 'A person smiles as she stands on a skateboard in a crowd with a photographer nearby'. Count the number of verbs in this sentence.
Example Output:
2