Syntax and programming grammar question and examples

For various language syntax forms in programming languages, how to distinguish them in grammar? You can use examples to illustrate the grammars and syntax forms of interest. If you already addressed this question last week, you may skip the question) Why attribute grammar? How is it applied when implementing a programming language? Use a simple example toillistrate the use of atibue grammar in progamning languages. Please do not use the textbook examples, however