I am trying to correct an oral communication exam i set my Japanese students. When talking about transport is it incorrect to say 'You need to change 1 time (on the train)' or is it better to say once? or perhaps it doesn't matter!
from very puzzled
You (will) need to change trains once. Emotion: smile
Usually you say:

1. Once. (one time)
2. Twice. (two times)
3. Three times, four times, four times, five times, six times and so on.
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 Mike in Japan's reply was promoted to an answer.
If you say "change on the train" it means change your clothing whilst on the train
Do people usually do that in Japan? Emotion: tongue tied
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You can drink liquor and smoke, so I don't see why not. Maybe our guest can tell you.