I know that some adjectives can have two comparative forms, and I'd like to ask you which of them are the most common in your region:
- cleverer or more clever;
- simpler or more simple;
- narrower or more narrow;
- shallower or more shallow;
- quieter or more quiet?
I'd say: more clever, simpler. more narrow/shallow/quiet.
Thank you in advance
Both are possible but the ones ending in -er are better in this case