Here's why we use "beforehand":
* Emphasis on Preparation: "Beforehand" highlights the idea of being ready or prepared for an event. It implies a sense of anticipation and planning.
* Specificity: "Beforehand" specifies that something happens before another event, rather than simply being before a general time. It suggests a closer connection between the two events.
* Formal Tone: While "before" is perfectly grammatically correct, "beforehand" often carries a more formal or literary tone.
Examples:
* "I packed my bags beforehand, so I wouldn't have to rush in the morning." (Emphasis on preparation)
* "The teacher gave the students instructions beforehand, so they knew what to do during the test." (Specificity of timing)
* "It's always wise to make reservations beforehand, especially during peak season." (Formal tone)
In some situations, you can use "before" instead of "beforehand," but "beforehand" adds that extra layer of meaning to emphasize preparation and timing.