I read that TweenSize "Returns: bool" (http://wiki.roblox.com/index.php?title=API:Class/GuiObject/TweenSize) so after I run the function I want to wait until 'bool' is returned before continuing, but I'm not sure how to read it.
Frame:TweenSize (UDim2.new(0, 0, 0, 0), 2, 0, 4, false)
--How do I wait until the above code 'returns bool' before continuing the script?
Frame:TweenSize (UDim2.new(0.05, 0, 0.05, 0), 2, 0, 4, false)

2 comments
As far as I know, the script doesn't continue until the tween has finished.
I wish this was true, I could provide an example if needed. If I loop tweening it stop working because functions start to run into each other. I'm tweening a lot of parts so thats why this wait is needed.