[Grammar] making sure everything was done that needed doing.

[yi-ing]

What does this underlined part mean? Is 'that' a part of a verb 'make sure'?

Everyone was busy wrapping the last minute presents, per-preparing the food for the next day, and making sure everything was done that needed doing.


Is this conclusion OK?Everyone was busy wrapping the last minute presents, (was busy) per-preparing the food for the next day, and (was busy) making sure everything was done that needed doing.

 

[Rover_KE]

Yes.

[STRIKE]per[/STRIKE]-preparing

pre-preparing

 

[yi-ing]

Yes.

[STRIKE]per[/STRIKE]-preparing

pre-preparing

So now what does "underlined part" mean? it is difficult to understand.

 

[Rover_KE]

Is it any clearer if we invert it?

... making sure everything that needed doing was done.