Abbreviations!

Hi there! I'm back!
Today I want to write about the 'abbreviations'.
So I'll write some sentences with the abbreviations and then I'll write the same sentences without them.
Today at school our English teacher showed us a 12-year-old girl's composition and I foud it so funny but at the same time I was so confused because there were too many abbreviations so I couldn't understand nothing.
 By the way now I try to write some sentences.

-2day I woke up L8.
-Today I woke up late.

-My ps went in London 4 hols.
-My parents went in London for holiday.

-Close the windows b4 u go out.
-Close the windows before you go out.

That's all for now! Tell me what you think about the abbreviations in a comment.
Ilysm! ;)

Paola.