come it

例句：

1. 1.Come on, we've got a long day ahead of us.
   来吧，我们还有很长的一天要过。
2. 2. Let's go for a walk in the park.
   咱们去公园散步吧。
3. 3. Start working on your project now.
   现在就开始做你的项目吧。