what's the diffrence of these two sentences??

R-s   Tue Dec 01, 2009 1:09 pm GMT
what's the diffrence of these two sentences??

What I am concerned about is ""making sure"" that my client and referral source are handled properly.

What I am concerned about is ""mak sure"" that my client and referral source are handled properly
pedro   Tue Dec 01, 2009 7:02 pm GMT
making sure that
to make sure that

you missing "to" in the second.