For example, if the suffix ‘ing’ is added to the ... like ‘ing’ and ‘able’: Often when a word ends in a ‘y’ like ‘party’, after dropping the ‘y’ you almost always add ...

For example, adding the suffix -able to the word 'prefer'. Let's try vaguely edible this time, and I'd prefer it if you didn't make a mess, ok? In the word prefer, the second syllable is stressed.