Country music was brought to the US by immigrants from Scotland and Germany.
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The director of the program graduated from Harvard University. He is planning to retire next year. ( Attributive clause )
You went to sleep during the lecture. This suggests that you should go to bed earlier tonight. ( Appositive clause )
We issued these instructions in writing. We were afraid that a spoken message might be misunderstood. ( Adverbial clause of purpose )
Tom was a powerful swimmer. He always won the race. (Adverbial clause of result )