How happily the girl were playing in the garden last Sunday!
感叹句的结构：
因为how强调的是形容词或副词,而what 强调的是名词,记住下列句型：
How +形容词/副词+主语+谓语+……!
How +形容词 +a / an +单数名词+主语+谓语+……!
What a / an +形容词+单数可数名词+主语+谓语+……!
what +形容词+复数可数名词/不可数名词+主语+谓语……!