Ответ:

Yesterday, I bought a birthday present for my mother, didn't I?

Did I buy a birthday present for my mother yesterday?

Did I buy a birthday present for my mother or for my sister?

Who bought a birthday present for my mother?

What did I buy for my mother?

Whom did I buy a birthday present for?

Now, wearable technology helps people stay healthy in new ways, doesn't it? Does wearable technology help people stay healthy in new ways now?

Does wearable technology help people or animals stay healthy in new ways now? What helps people stay healthy in new ways now?  What kind of technology helps people stay healthy in new ways now?  How does wearable technology help people?

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