     -   If.   
If  then 1 else 2 ;
,   ,   1,   ,  2. 
:
If A:=3 then writeln('  3') else writeln('   3');

  then  else    ,    :

begin
;
;
end;

:
If A<>0 then begin
B:=9;
C:=A+B;
write(C:3);
end;
else begin
B:=7;
C:=A-B;
write(C:3);
end;

   
  ,         "" (then). :
If 1 then 1;
If 2 then 2;

