should've

[Saneta]

http://www.english-test.net/toeic/listening/what_should_i_have_done_differently.html

You should've been more careful.
The first time I have seen the shorter form: should've, does it mean:
should have?
for should not have been ,is: shouldnt've been? - I don't like it...

Thank You.

[Beeesneees]

should've is should have.

The negative abbreviated term, shouldn't've is not used (written).
Shouldn't have is as abbreviated as it gets.
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[Saneta]

what does it mean: 'as it gets' in this context?
thanks

[Beeesneees]

'as <smthng> as it gets' = It is never seen any more <smthng> than that.
examples

as cold as it gets - it never becomes any colder
as small as it gets - it never becomes any smaller
as amazing as it gets - it has never appeared any more amazing
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[Saneta]

Thank You,B. please tell me yet what does it mean: smthng=something? e.g. :cold, small,amazing are adjectives ,can't be called something..?

[Beeesneees]

Yes, 'something'
Anything -- including adjectives -- can be called something when we are referring to the words themselves.
'something' here simply indicates a word of any description at all.
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