Two periods ahead expectations


I was wondering how can I express in Dynare expectations with an information set up to and including period t-1, of variables at period t+1, that is

E_t-1 x_t+1

If I define a new variable, s = x(+1) (in Dynare language) and then I take the lag s(-1), I only get E_t-1 x_t.
Can I just define p = x(+2) and then take p(-1) or there is another way to define two periods ahead expectations in Dynare?

Thanks a lot for any help, comment, suggestion.


This is exactly how you do it. p = x(+2) and then take p(-1)