So, this is for a few reasons.
Syntax is a skill floor, but it's not anywhere close to a skill ceiling.
If you want rapid-fire example of the various forms a given language commonly uses, I recommend X in Y minute guides. Those show off the various bits of syntax for a given programming language, though without rigorously defining them as such.
Part of the reason that programming syntax is usually taught by example, rather than by formalism is that the formalisms for programming syntax, well, look like this: (cribbing from wikipedia).
program = 'PROGRAM', white_space, identifier, white_space,
'BEGIN', white_space,
{ assignment, ";", white_space },
'END.' ;
identifier = alphabetic_character, { alphabetic_character | digit } ;
number = [ "-" ], digit, { digit } ;
string = '"' , { all_characters - '"' }, '"' ;
assignment = identifier , ":=" , ( number | identifier | string ) ;
alphabetic_character = "A" | "B" | "C" | "D" | "E" | "F" | "G"
| "H" | "I" | "J" | "K" | "L" | "M" | "N"
| "O" | "P" | "Q" | "R" | "S" | "T" | "U"
| "V" | "W" | "X" | "Y" | "Z" ;
digit = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9" ;
white_space = ? white_space characters ? ;
all_characters = ? all visible characters ? ;
Can you take that grammar and write 10 examples of valid statements from it, with no other context?
vs, if I give you
PROGRAM ASSIGNMENTS
BEGIN
MYSTRING := "A STRING";
MYNUMBER := 123;
END
That gives you a much better flavor from looking at things.
Ultimately, most programming languages should have defined grammars in their docs somewhere, but most devs use them by intuition, rather than formally.
The other thing, as well, is that it's one you get past grammar as a primary concern that you gain true fluency. And there are a lot of things that are higher level than grammar that can aid/hurt a program much more than the grammar constructs (like various patterns, know algorithms, schemes of organization for different types of projects, and so on). A mostly human-usable grammar is table-stakes these days.
If you have a specific language you want examples or a grammar on, let me know, and I'll see if I can find it.
(edited for formatting)