When you talk about 'prepositions of transportation, just consider this: ON = you are permitted to stand up when the vehicle is moving. In = you must sit down.
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The preposition “on” is used when we are referring to a wide/big vehicle where we can walk inside of it (e.g bus, train, airplane. etc.). On the other hand, the preposition “in” is used when we are referring to a vehicle which is narrow (car, ambulance, etc.).
In Britain, a comfortable bus that carries passengers on long journeys is called a coach. The coach leaves Cardiff at twenty to eight. In America, a vehicle designed for long journeys is usually called a bus.
GRAMMAR: Patterns with taxi• You say get in a taxi: He got in a taxi and left. ?Don't say: get on a taxi• You say get out of a taxi: Two women got out of the taxi. ?Don't say: get off a taxi• You say that someone is in a taxi: I read my notes while I was in the taxi.