UKAbbreviation Has 3 Rules

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 All vowels are deleted unless they are the first letter of the word. 

Elevator: Elvtr, car: cr, Nevertheless: Nvrthlss, example: exmpl

If the same vowels follow each other in a word, one of them is retained.

School: schol 

Some prepositions are exceptional. The Abbreviation rules for exceptional prepositions can be found below:

To:               t  

for:              f

how:           h

but:             b

the:              th

This:            ts

That:           tt

These:        ths

Those:        thos

Are:              r

What:          wt

When:         wn

which:         wh

will:              wl

would:        wd

can:              cn

could:          cd

going to:     gt