Accessing Portuguese Dictionary with system set to English

Hi,

I am a native English speaker but regularly need to write documents in Portuguese. I can do this when I set the input to Portuguese at the top. I can for example very easily write "há" for example. The problem is that there are red lines under just about every single word I type signifying that it is all one big spelling mistake. Is there any way to set Pages so that red lines will only show under words spoken incorrectly in Portuguese!?

Thanks,

Crazy