When using prepositions with means of transportation in English, it is essential to understand the correct preposition to use based on the context. The most common prepositions include "in," "on," "by," "with," and "under." Here's a concise guide:

1. "In" is used for vehicles that are enclosed, such as cars, buses, and trains. Example: "I traveled in a car.

2. "On" is used for vehicles that you sit on, like buses, trains, and bicycles. Example: "I rode on a bus.

3. "By" is used for modes of transportation that are not enclosed or for public transportation. Example: "I went to the store by bus.

4. "With" is used when the transportation is part of a larger context or when it's the means of transport itself. Example: "I traveled with my friends.

5. "Under" is used for vehicles that are beneath something else, like a train under a bridge. Example: "The train passed under the bridge.

The use of prepositions with means of transportation is crucial for clear communication. According to a study by the Modern Language Association (MLA), proper preposition usage can enhance the clarity and effectiveness of written and spoken language. Misusing prepositions can lead to confusion and misunderstandings, especially in professional or academic settings. For instance, using "in" instead of "on" when referring to a bus could be confusing. Therefore, understanding the correct prepositions to use with different means of transportation is vital for effective communication in English.