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

Example Input: Sentence: 'A man and a woman walking towards a food vendor that is across the street'. Count the number of verbs in this sentence.
Example Output: 2

Example Input: Sentence: 'A oil tanker train on the tracker with mountains in the background'. Count the number of verbs in this sentence.
Example Output: 0

Example Input: Sentence: 'Two motorcyclists performing stunts for spectators who are watching beyond the fence'. Count the number of verbs in this sentence.
Example Output:
2