«A» implies a class of objects. «I am on a train» means that the vehicle you are on (in) belongs to the class of trains. «The» implies a certain element of a class: A mobile phone convesation: — Have you arrived?
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NimbleHi
I wonder if anybody could help me, It is regarding use of either "A" or "The" in the following sentence:
1. I am on the train orYou (and probably the audience/reader) know which train you are on.
2. Iam on a trainWhich train is unimportant or unknown.
Please explain whi