In this task, you need to count the occurrences of the given word in the given sentence.

Sentence: 'a man and a woman riding a motorcycle next to a crowd'. Count the occurrences of the word 'a' in the given sentence.
4

Sentence: 'a man surfing at the base of a large wave'. Count the occurrences of the word 'a' in the given sentence.
2

Sentence: 'a white dish filled with vegetables on a white table'. Count the occurrences of the word 'white' in the given sentence.

2