Thank you for your help. Here goes some more questions related to 'subway'

1. You should be quiet in the subway.
2. You should be quiet on the subway.
3. You should be quiet on the train.
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#1 means: You should be quite when you enter the subway station. The place doesn't mean 'on the train.' I mean "in the subway" doesn't include 'on the subway." Is that right?

#2 means: You should be quite when you get on the subway or get on the train. Inside the train, you should be quiet.

#3 means:In the subway station, the moving vehicle is "the train." So he should be quiet on the train in the subway station. Can't we use "in the car" in the subway station?

What do you think about my explanation? Would you correct errors? Thank you.

You're correct about 2 and 3, but if you want 1 to mean "in the station" then that's what you should write -- or "in the subway station."

Your explanations are mostly correct, but let me clarify a few points:

1. "You should be quiet in the subway." - This means you should maintain silence in the subway station, where people are waiting for the train, rather than specifically inside the train.

2. "You should be quiet on the subway." - This means you should be quiet while inside the train. It refers to maintaining silence once you are on the subway train.

3. "You should be quiet on the train." - This sentence is not specifically related to the subway; it refers to any type of train. So, it could be a subway train, a commuter train, or any other form of train. The emphasis here is on being quiet while on the train, regardless of the location.

In your explanation for #3, you are correct that "the train" refers to the moving vehicle inside the subway station. The term "in the car" is generally not used in this context because "in the car" could also refer to being inside a private vehicle like a car on the road.

Overall, your explanations are quite accurate. I hope this helps clarify any confusion!