desert
The Italian word 'deserto' is used in much the same way as the English term 'desert'. It describes a vast, sandy area without much plant life, often characterized by high temperatures. For example, 'Il Sahara è un deserto molto grande' means 'The Sahara is a very large desert'.
The desert is a very dry place.
This sentence is a simple subject, verb, object structure. 'Deserto' is the subject, 'è' the verb (is), and 'un luogo molto secco' the object (a very dry place).
I am lost in the desert.
In this sentence, the speaker uses the verb 'sono' (am) to express his condition of being lost in the desert. 'Nel' is a preposition of place (in the) and it is used before 'deserto' which means desert.
Life in the desert is difficult.
This is another simple sentence that uses 'deserto' within a prepositional phrase. 'La vita' (life) is the subject, 'è' the verb (is), and 'difficile' (difficult) is the adjective describing the life in the desert.