倒装用法：
Here it is. 它在这。
Here you are!给你！
感叹句
How beautiful the flowers are!这些花好漂亮啊！
宾语从句：
I wonder how much the milk is.我想知道牛奶多少钱
用于一般疑问句的答语：
Are Mary's new dresses colourful? Yes， they are. / No， they aren't.
Was mother in the kitchen then? Yes， she was. / No， she wasn't.
Were you at home the day before yesterday? Yes， I was. / No， I wasn't.
Was she late this morning? Yes， she was. / No， she wasn't.
