http://chanyi.new21.net/zbxe/64963
 10. 자동사의 수동태 불가형

▶ Point
수동문은 본래 능동문의 목적어를 주어 자리로 옮겨와서 만드는 것이므로 본래 목적어가 없는 1형식 완전자동사나 2형식 불완전자동사는 원칙적으로 수동태가 없다.

▶ Practice
․ When they [were appeared / appeared] for the first time in the 19th century, they were blank.

․ The city was stunned by a huge earthquake that [was happened / happened] in the early hours of the morning.

․ Mayonnaise is a creamy sauce or dressing that [consists / is consisted] of oil, egg yolks, lemon juice or vinegar.

․ In 1848, the first organized meeting for women's rights in the United States [took / was taken] place in Seneca Falls, New York.