Unless (subordinating conjunction) it begins (finite verb) to snow (infinitive) , the ski resort (noun phrase) will not be able (finite verb) to open (infinitive).
"begins" is a present tense finite verb.
"to snow" is an infinitive form of the verb "snow."
"to open" is an infinitive form of the verb "open."
The sentence is complex sentence because it consists of an independent clause ("The ski resort will not be able to open") and a dependent clause ("Unless it begins to snow"). The dependent clause is introduced by the subordinating conjunction "unless."
The participles and gerunds are not present in this sentence. Overall, the sentence expresses a condition (unless it begins to snow) and its consequence (the ski resort will not be able to open), indicating that the opening of the ski resort is dependent on the occurrence of snowfall.
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