语法总结
Why...? Because...
Why 询问原因，Because 引出原因。
例：Why do you like the room? Because it's big.
Which 引导的特殊疑问句
Which room do you like? 用来在多个选项中询问哪一个。
例：Which room do you like? The bedroom.
现在进行时肯定句
主语 + am/is/are + 动词-ing，表示此刻正在发生的动作。
例：Mum is cooking dinner. They are doing homework.
现在进行时特殊疑问句
What + am/is/are + 主语 + doing？询问某人此刻正在做什么。
例：What is Dad doing? He is washing the dishes.
动词-ing 拼写变化
一般动词直接加 -ing；以不发音 e 结尾去 e；短元音加辅音结尾通常双写末辅音。
例：cook → cooking; make → making; sit → sitting.