Hi, A friend of mine (Japanese) says you use (a) when you are thinking aloud whereas in (b) it's all silent. Is it necessarily true?? Is it really a matter of vocalization ?
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MrPedanticI don't think there's anything particularly crazed about talking to yourself, e.g. when driving, or puzzling something out, or looking for an object/person. ("Now, where did I put that axe...")
MrP