今天我们要学习的短句是：
What's the occasion today?
I'm just curious as to why you didn't tell her the truth.
89: What's the occasion today? 今天是什么大日子？
这是经常能用到的一句英文。回答比较简单，可以用省略句来回答。
比如可以直接说：Peter's eightieth birthday! 前面的It is被省略了。
现在来学习一下句中的关键词：
occasion: 特殊场合；重大活动；盛会
例如：
Sara's party was quite an occasion - there were over a hundred people there.
萨拉的聚会真是一次盛会——有一百多人参加。
关于occasion，有几个常见搭配需要熟练掌握：
-on special occasions 在特殊的场合
-on the occasion of 值此...之际
-on occasion 有时；偶尔，间或
90: I'm just curious as to why you didn't tell her the truth. 我只是好奇你为什么不告诉她实情。
这是一句很棒的英文，其中有好几个值得学习的要素。
-be curious about 对...好奇
例如：
Babies are curious about everything around them.
婴儿对周围的一切都很好奇。
-as to 关于，至于（相当于about，例句中用的是be curious as to其实就等同于be curious about）
例如：
He was uncertain as to which road to take.
他拿不准该走哪条路。
-tell her the truth 告诉她实情
这里大家需要注意另外一个地道习语：
to tell (you) the truth 说句老实话，说实话
这里的意思相当于：to be honest
例如：
To tell (you) the truth, I didn't understand a word of what he was saying.
说实话，他说的我一点儿也听不懂。
总结一下：
-What's the occasion today? 今天是什么大日子？
-be curious as to/about 对...好奇
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