Leebo
at 2019-01-18 09:01:42 UTC
の makes what comes before it into a noun, in this case. This is definition #2 of の here on Jisho. So the preceding phrase (あのデパートで買い物する) becomes one big noun phrase.
Then, が is just the normal subject marking particle.
tokyojerry
at 2019-01-21 08:19:45 UTC
The 「の」 takes the preceding verb (買い物する）and nominalizes it to make the verb into a noun / topic. i.e., I shop vs. I (like) shopping. The 「が」defines it as the topic of sentence. i.e., What do you like at that department store? I like shopping at that department store. Shopping becomes the topic of the sentence and is defined / identified by the 「が」particle. Cheers.
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What is the purpose of 『のが』in this sentence?
Could somebody explain to me what grammatical purpose 『のが』serves here? The rest of the sentence makes sense to me, but I couldn't figure that part out.