Answer:
<u>complex (dependent clause + independent clause) :</u>
Although the dentist did not find anything wrong, Sue's mouth still hurt.
<u>compound-complex (dependent + independent + independent) :</u>
Although the dentist found nothing wrong with Sue's teeth, she still had a toothache, so she went to bed.
<u>compound (independent + independent) :</u>
The dentist did not find anything wrong with her teeth, but Sue continues to have a toothache.
<u>simple sentence (a single independent clause):</u>
The dentist did not find anything wrong with Sue's teeth.
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Explanation: