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You really found something to cavil at :) I don't really see any difference between

Доктор спросил, болит ли голова and Доктор спросил, болела ли голова.

Well, maybe there might be a subtle...

1) Mom asked the son if he knew what time the shop opened.

Мать спросила сына, знал ли он в какое время открыт магазин. - This one is very good, however мать is more like mother and мама is more...