"Put up" 的现在进行时形式是 "are putting up"。这个短语通常用来表示某人正在挂东西(如照片、画作等)在墙上,或者正在搭建或布置某物(如帐篷、装饰等)。以下是一些例句:

1. They are putting up a new tent in the backyard.
2. She is putting up some pictures on the wall.
3. The children are putting up decorations for the party.