In chapter three: Huts on the Beach Ralph and Simon are in the process of constructing the third shelter.
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They make three huts.
In chapter three: Huts on the Beach Ralph and Simon are attempting to erect a third shelter but the two previous shelters must have been erected during the unrecorded elapsed time period which occured between the end of chapter 2 and the begining of chapter 3.
In Chapter 3, Ralph, Simon, and Jack were all suppose to help with building the huts, however Jack felt that hunting was more important.
They steal a burning branch from the fire near the huts. They steal a burning branch from the fire near the huts.
I presume that you are referring to the start of chapter 3: Huts on the beach where Jack is alone in the forest. The answer is that Jack is trying to hunt pigs.