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

Example Input: Sentence: 'A little cat sits on a laptop keyboard'. Count the number of verbs in this sentence.
Example Output: 1

Example Input: Sentence: 'A military airplane is sitting on the runway'. Count the number of verbs in this sentence.
Example Output: 1

Example Input: Sentence: 'some fridges stacked on each other to look a bit stonehenge like'. Count the number of verbs in this sentence.
Example Output:
2