can amides become protonated at low pH?

I've been reviewing some recent practice questions and realized that I'm not quite sure what to do with functional groups other than carboxylic acids or amines when the pH varies. If a compound has a functional group such as an amide, do we assume that this does not act as a base and become protonated at low pH values? Is it only carboxylic acids, amine groups and phosphates that become protonated and de-protonated in compounds?


Hope this doesn't sound too dumb...

thanks!