Could someone suggest a good way to fix it?

I have the drywall around the cover plate missing a corner.  What is a good way to fill in a material that will make it complete?  The problem is there is no support for the space to fill in something like caulk or spack;e.  And if I attach a piece of cardboard (or anything similar) to the space, it will make the edges all uneven (rising up).

I don't have stable internet connection for my laptop right now, so I might not respond to you in time.  But thanks in advance for giving me suggestions during the holiday time.  I really apprecaite it.  I have been thinking a lot and googling, but with no good result.  Someone suggested using newspaper to fill in the space and then spackle, but how does the newspaper stand there?  It is a bottomless hole.

 

I also posted at a different site.  I am clueless to a seemingly small problem.  Thanks so much!

http://bbs.wenxuecity.com/myhouse/5800114.html

所有跟帖： 

• RE: More info -joeyli- ♀ (284 bytes) () 01/03/2017 postreply 09:12:02

• https://www.youtube.com/watch?v=Fdy9uRvpI-E -(G)- ♂ (0 bytes) () 01/03/2017 postreply 09:57:57

• very good! Thanks! -green_grass- ♀ (0 bytes) () 01/03/2017 postreply 14:08:38

• This is an easy task. Apply drywall putty and drywall tape. Smo -jassco- ♂ (0 bytes) () 01/03/2017 postreply 11:00:13

• 去買plaster -calvinwch- ♂ (193 bytes) () 01/03/2017 postreply 11:50:24

• 这个不用两块钱就可以弄得很好看，什么人都可以做， -梁山sl- ♂ (66 bytes) () 01/03/2017 postreply 20:03:41

• 笑死了，很赞，就是这样！ -梁山石燕- ♂ (190 bytes) () 01/03/2017 postreply 23:51:20