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

Example Input: Sentence: 'A brown cow walks on a road with two motor bikes in the background'. Count the number of verbs in this sentence.
Example Output: 1

Example Input: Sentence: 'A few cars in a parking next to a small green van'. Count the number of verbs in this sentence.
Example Output: 0

Example Input: Sentence: 'People are standing on a street in front of a building'. Count the number of verbs in this sentence.
Example Output:
1