BEGIN / END Wrapper with RETURN command. Why?

With TSQL functions, wrapping the RETURN command in BEGIN and END commands seems to be mandatory.  (See the attached code snippet.)  The two commands seem superfluous.  After all, functions in other programming languages (VB.NET, VBA, PHP, JavaScript...) don't require the equivalent of RETURN be wrapped in BEGIN and END.  So why are they required with TSQL?
CREATE FUNCTION dbo.centigrade_to_farenheit (@centigrade float)
RETURNS float
WITH EXECUTE AS CALLER
AS
BEGIN  -- Why is this BEGIN command necessary?
     RETURN((@centigrade * 1.8) + 32.0)
END  -- Why is this END command necessary?
GO

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jdanaAsked:
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Aneesh RetnakaranDatabase AdministratorCommented:
you need to mention the BEGIN END in the function definition except for Inline Table-valued Functions
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chapmandewCommented:
Because that his how the language is....  :)
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HoggZillaCommented:
The body of a function in SQL Server is defined by a BEGIN and END. That's it, no reason, it just is. :-)
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jdanaAuthor Commented:
It is what it is.  Thanks!
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MohammedUCommented:
You have to follow the syntax and the question is why you nee BEGIN and END can be answered only the MS sql developers....
Every language has its own syntax and it doesn't need to be the same as other languages...
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