5She had been looking rather miserable recently and they wondered what might have happened to her.
I wonder if I replace looking with seeming or appearing, is the sentence still correct?
'Seeming' sounds unnatural to me; 'appearing' is possible, but I prefer 'looking'.
And I still don't know why looking can be continuous? I've been taught that look never has the continuous form if it is followed by an adjective. You were taught incorrectly. An appearance/ a look can be of limited duration; if it is, then the continuous form is appropriate.
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