----------------------------------------
I   | play       |         | at home.  |
You | donot play | soccer  | at school.| 
We  |            |         |           |
----------------------------------------

Result: 
No. of possible sentences: 3X2x1x2=12 

Sentences are: 

I play soccer at home.
I play soccer at school.
I donot play soccer at home.
I donot play soccer at school.
You play soccer at home.
You play soccer at school.
You donot play soccer at home.
You donot play soccer at school.  
We play soccer at home.
We play soccer at school.
We donot play soccer at home.
We donot play soccer at school.