What is the function of the conjunction 'but' in the following sentence: 'I wanted to go to the park, but it was raining.'?

What is the function of the interjection 'Wow!' in the following sentence: 'Wow! That was an amazing performance.'?

What is the function of the preposition 'under' in the following sentence: 'The cat is sleeping under the table.'?

What is the function of a conjunction in the sentence: 'I like apples and oranges'?

In the sentence: 'Despite the cold weather, they went for a walk', what is the function of the preposition 'despite'?

What function does the interjection 'Oh!' serve in the sentence: 'Oh! I forgot my keys.'?