You understand the use of the tenses correctly. Sue didn't eat anything today, but she ate a lot yesterday. The above sentence can't be said when 'today' is over .
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Anonymous2) Dawson had been taking a shower when his father arrived (2a). Here I could also rewrite it by saying: Dawson had taken a shower when his father arrived (2b), couldn't I ? The only difference is that in the first example, when the second