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Playing outside with your friends is an inherently happy experience. It's a source of great joy. The bell used to indicate the beginning of recess is neutral, if not even a little negative if it's too loud or harsh. It can even hurt your ears!

But, as that recess bell accurately predicts the beginning of recess, you may get really excited and happy each time you hear it. Even outside of school, when you hear a similar-sounding bell, you may well up with the same positive emotions.

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In classical conditioning, the conditioned response is learned response to the previously neutral stimulus. For example, the feeling for hunger and keeping a check on time is an unconditioned stimulus, an urge to play and eat food in response to the time in response to the smell is an unconditional response, and the sound of the bell when you check the time is the conditional stimulus. The conditioned response would be feeling hungry and playing with your friends when you hear the sound of the bell.

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Before conditioning means that a stimulus in the environment has produced a behaviour / response which is unlearned/ unconditioned  and therefore is a natural response which has not been taught. In this respect, no new behaviour has been learned yet.

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A neutral stimulus (recess bell) is repeatedly paired with the unconditioned stimulus (having recess). As a result of this pairing, an association is formed between the sound of the bell and recess. A child becomes conditioned to respond to this stimulus with happiness.

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The unconditioned response to the recess bell is the same response to any similar sounding bell. In this case simillar sounding bell is a conditioned stimulus to which our conditioned response is happiness.