We have to choose the cases which tests the major 
functionalities of an application.

we have to do this sanity testing at each and every Phase 
as an exit criteria which is to be satisfied.

Test cases which represents the main functionality of the 
application. it is done at every phase till the application 
get exit. it is always done to check whether the 
application can withstand the regression testing.

test cases 4 Sanity testing can be prepared only based on 
the possitive functional flow of module or bulid

Hi
Test Cases for sanity testing are the test cases which 
covers the major functionality of the application are 
considered.There wont be any seperate test cases written 
for sanity testing.

Sanity testing is done to test whether the application is 
ready for major part of testing.i.e is at the end of each 
testing phase and entering into next testing phase sanity 
testing is done