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For example, we Japanese often begin speech with 'but'.
This may be ununderstandable (unun!) for foreigner.
By the way, why do we use 'but' at first in conversation?
Let’s use dictionary.
In Koujien, ‘but’ is written in three meaning.
In easy words,
1. Paradox
2. Comparison.
And third meaning is important.
3. Use to raise a subject with impression.
OK, I understand.