疑问句
yes-no 问句
Credit cards are popular in Taiwan. 信用卡在台湾很普遍。
→ Are credit cards popular in Taiwan? 信用卡在台湾很普遍吗？
She was very angry when the waiter spilled coffee on her white dress.
当服务生把咖啡泼洒到她白色的洋装上时，她好生气。
→ Was she very angry when the waiter spilled coffee on her white dress?
当服务生把咖啡泼洒到她白色的洋装上时，她很生气吗？
Is there any reason for his absence? 他有任何缺席的理由吗？
