Whoever her parents are must be worried sick.
Is this grammatical?
Is this grammatical? Yes, but the style sucks. Her parents must be worried sick.
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JungKimWhoever her parents are must be worried sick.Is this grammatical?
Yes, but the style sucks.
Her parents must be worried sick.
JungKimWhoever her parents are must be worried sick.
Is this grammatical?
Whoever her parents are must be worried sick.
It is grammatical, as MM says, but I'd say that the use of "whoever" makes your example semantically slightly different to Her parents must be worried sick in that that it contributes an
JungKimWhoever her parents are must be worried sick.
Is this grammatical?
I would write it this way:
Her parents, whoever they are, must be worried sick.
It has two ideas: the identity of the parents is unknown to the writer and under these circumstances, any parents would normally be sick.