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Khan Academy
Khan Academy: Complex and Compound Complex Sentences: Quiz
Choose the sentence that correctly combines two statements in order to create a complex or compound-complex sentence in this seven-question quiz.
English Zone
English zone.com: Noun Clauses: Using Infinitives
An interactive exercise with four examples followed by ten sentences. Students complete each question by combining two sentences while using an infinitive phrase. When finished, students can check to see how many answers are correct.