Hi! Are the underlined subordinate clauses? Thanks, Fulvio
1. If you study, I'll buy you a bicycle.
2. If you are going to study, I'll buy a bicycle.
Yes.
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Traditional grammar analyses this "if" as a subordinating conjunction that introduces conditional clauses.
But modern grammar analyses it as a conditional preposition, so the underlined elements are not clauses but preposition phrases.
I much prefer the modern analysis. See this up-to-date dictionary: