starts后面接动词什么形式

后面接动词的to do形式，例如：

1、Her baby starts to fret as soon as she goes out of the room.她一走出房间，婴儿就躁动起来。

2、It could easily be another year before the economy starts to show some improvement.很可能还要再等一年经济才会开始出现好转。

3、It will not be long before the inflation figure starts to fall.过不了多久，通货膨胀率就会开始下降。