Usually. Just as my pronunciation varies depending on factors such as who I'm talking to, where I am and which way the wind is blowing (sometimes with two different pronunciations in one sentence), so does my (99.8% of the time correct*) usage of apostrophes. (*What can I say, I went to an old-fashioned school which drummed it into us (and likewise my granny); ditto times tables.)
Re the headmistress, I suppose she might have just been having on off day - I do sometimes find when I'm really really tired I write (in fact more often type) uncharacteristic things (for me), like homonyms & stray apostrophes, despite the fact that it's been automatic to get it right since I was about ten.
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Usually. Just as my pronunciation varies depending on factors such as who I'm talking to, where I am and which way the wind is blowing (sometimes with two different pronunciations in one sentence), so does my (99.8% of the time correct*) usage of apostrophes. (*What can I say, I went to an old-fashioned school which drummed it into us (and likewise my granny); ditto times tables.)
Re the headmistress, I suppose she might have just been having on off day - I do sometimes find when I'm really really tired I write (in fact more often type) uncharacteristic things (for me), like homonyms & stray apostrophes, despite the fact that it's been automatic to get it right since I was about ten.