Word Find and Replace

Is there any way you can use Find and Replace to replace very specific instances of words?

For instance, in my document I have "sent" and would like to replace it with someone's name so that it becomes "Name sent", but in the document I also have parts where it says "You sent". Is there any way I can get Word to ignore the "You"s in front of the word sent and only have it replace text where there is no "You" in front of sent?

I tried using the wildcard [!You] but that didn't seem to work. 

Thanks

Justin