Originally Posted By: Jay Lyman
I know I should have entered this in the pleonasm contest, but I am new here.
My least favorite pleonasm is do do, as in; .....and when they do do that.........
When is it ever necessary to use two do's, except for when speaking to or about pets? And then, why not just call it what it is?


This structure is generally used when explicitly contrasting with someone's not doing something.

E.g.:

When they don't do their homework their grades in the class suffer, but when they do do their homework they generally learn more and get more benefit from the class.