It's better for...to...
Es mejor que
Have you thought of...?
�Has pensado en...?
It's not advisable that you...
No te conviene
Don't forget to...
No te olvides de
It would be a good/bad idea to...
Ser�a buena/mala idea
I suggest that...
Sugiero que
I advise you to...
Te aconsejo que
I recommend that Juan...
Le recomiendo a Juan que