In Linq.......how compiler understands from clause

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ASP.NET4

I am new to linq..Please make me clear. Why select clause comes after from clause? Please don't paste answer like

"The reason is, LINQ is used with C# or other programming languages, which requires all the variables to be declared first. From clause of LINQ query just defines the range or conditions to select records. So that’s why from clause must appear before Select in LINQ."

i din't understand the meaning of range or conditions what it means.

thanks in advance