“There comes a bus” is correct from a word order point of view. But you could also say, “A bus is coming.”
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This very similar question may be helpful. If there is a difference, 'take the bus' means 'my usual bus' - 'I take the bus (that is, a specific bus) to work every morning', and 'take a bus means 'any bus' - 'To get from here to Central Station, take a bus (that is, any bus) along George St'.
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.).
You usually take the same bus everyday to go to school or commute. The time and bus number (or school bus) rarely change. And when you say I will take the bus, an interlocutor can assume or know which bus you are taking.
The answer is both are correct; to travel on a bus and to travel by bus mean the same thing. No matter which term is used, it simply implies that a person is using a bus to get from one place to another. However, the use of the preposition 'on' in to travel on a bus sounds more natural in English than to travel by bus.
Busses is predominantly used in ???? American (US) English ( en-US ) while buses is predominantly used in ???? British English (used in UK/AU/NZ) ( en-GB ). In the United States, there is a 85 to 15 preference for buses over busses. In the United Kingdom, there is a 92 to 8 preference for buses over busses.
The word bus is short for omnibus, which means “for everyone.” Bus was first used in this sense in the 1830s, its everyone meaning referencing the fact that anyone could join the coach along its route, unlike with stagecoaches, which had to be pre-booked.