外研版

weather is! 转为陈述句时为： The weather is hot这时句子的开始单词为 the weather， 再来看感叹句在 the weather 前只有形容词，所以应用 how。至于是用 what a 还是 what 要看名词的具体情况而定，单数可数名词加 what a 其余的加用 what。

［误］ We have to sing this， have we? 

［误］ We have to sing this， haven't we? 

［正］ We have to sing this, don't we?

［析］ 在反意疑问句中除了标准的一些常规外，有一些例外： Let's go home， shall we? Let us go home， will you? She had to leave， didn't she?