predicate adjective
Not all deserts are sweltering.
The snowy continent of Antarctica is a desert.
Deserts are places with little rainfall.

Answer :

If the question is in what sentence do you see a predicate adjective, then the correct answer is in the first one - Not all deserts are sweltering, where the word sweltering is a predicate adjective.
A predicate adjective is an adjective that can be found following a verb. 

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