problem Keyword token antlr

Question

If the 'for' is used both as a command and as "the English word":

for_statement: 'for' ...

id: 'for'
  | ID
  ;

ID: ...

right? My problem is how to differentiate the two cases. For example for_statement is only possible beginning of a line (only if preceded by ' ' or '\t').

For example:

echo for print example
for i in {0..10..2}
  do
     echo "Welcome $i times"
 done

Sample outputs:

for print example
Welcome 0 times
Welcome 2 times
Welcome 4 times
Welcome 6 times
Welcome 8 times
Welcome 10 times

Thanks.