Why does the sentence below use "have", instead of "do"?
Why have deaths stayed steady while Covid-19 infections are spiking?
This is called the present perfect tense. It links between the past and the present. It consists of verb 'to have' followed by the past participle (like 'have stayed' in your example). If this is a scientific fact, you can use the present simple tense. That's to say: 'Why do deaths stay steady while Covid-19 infections are spiking?'
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