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

Example Input: Sentence: 'A boy doing a trick with a skateboard on a ramp'. Count the number of verbs in this sentence.
Example Output: 1

Example Input: Sentence: 'A large white polar bear eating a carrot'. Count the number of verbs in this sentence.
Example Output: 1

Example Input: Sentence: 'A couple of bikes parked in front of a bus'. Count the number of verbs in this sentence.
Example Output:
1