讲义
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？