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Take a look at these sentences:
I knew that something terrible was happening to my daughter and husband.
I knew that something terrible has been happening to my daughter and husband.
Which one would be correct?
Also, in this sentence:
At 21 years old, a little voice inside his head told him to fight harder than he had ever done before in order to get healthy.
Why is it "Had ever done before" instead of "Has ever done before" ?
The present perfect continuous is used in various ways, but in this context the expected meaning is "occurring for some time, including right now".
(Up to the present moment, and ongoing) Something terrible has been happening to my daughter and her husband.
This makes it odd to use with the past tense, because we can't reconcile something known in the past with something that is happening now. Instead you need to use the past perfect continuous:
I knew that (up to that past moment, and ongoing) something terrible had been happening to my daughter and her husband.
This explains why your second sentence uses the past perfect, because the action takes place in the past, when he was 21 years old.
