Here My explanation is :
I. We run TM for 1,2,3,4,5....n if it stops in any of these then yes otherwise no
II. We run TM for n steps if it stops yes otherwise no
III. We run TM for n, n+1, n+2.....infinity so if it halts we can say yes but if do not halt we can't say anything because we have to run it infinite number of times
Is my explanation correct?