Hi, I think we use 'one of' when we mentally count. Let's see how many teeth that he broke. He broke (only) one of his teeth.
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MarvinTheMartianIn a stand-alone sentence, however, it becomes unclear whether to use "a" or "one of".I think one thing you seem to have forgotten is that in real life and in real language, sentences are generally not "stand-alone". In real language, there is generally some kind of context. The context might be verbal and/or non-verbal.
M
MarvinTheMartianFor instance, in the following dialogue, would you say "I took" or "I've taken":
A: Where's my favorite coffee mug? I can't find it. It's not in the cupboard.
B: I took it out / I've taken it out. It's on the ta