Canada might give up its marketing boards if the European Community gives it grainsubsidies,

Explanation

- "if the European Community gives it grain subsidies" is an adverb clause, modifying the verb "might give up" and indicating the condition under which Canada might give up its marketing boards.- The adverb clause consists of the subordinating conjunction "if" and the independent clause "the European Community gives it grain subsidies", which functions as an adverb.- Adverb clauses often modify verbs, adjectives, or other adverbs, and in this case, "if the European Community gives it grain subsidies" is an adverb clause modifying the verb "might give up".