How to say in Czech: Are they allergic to anything?

English
Are allergic to anything?
Czech
Jsou na něco alergičtí?
They are allergic to dairy products.
What are they allergic to?
They are not writing anything.
They never forget anything.
But they have not eaten anything!
Do they need anything?
Do they need anything else?
Have they forgotten anything?
Have they lost anything?
They can write about anything.

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