Shadows wrote: Actually, those are suffixes. Inflectional suffixes, to be more precise.
To begin with, in the memory test, all the words have five letters. Make sure your answers all have five letters.
I suggest you look at each word as a whole. For example, don't think of "minds" as "mind + s"; just think of it as "minds". Don't think about plurals or tenses either; it just clutters up your working memory. Look at the words as if they're individual works of art. Think about the meanings of the words if you want to, but make sure you're thinking about the meaning of "minds", not the meaning of "mind". Once you get used to looking at the whole word, "minds" and "mind" will look very different to you.
Thanks Shadows. The five letter rule is very effective, so I'll use that in the future. However, I don't think I can see them as 'individual works of art' for most suffixes because I use the link system for the memory test. Most suffixes (unlike prefixes) only change how you use words, not what they *basically* mean. I'd imagine a ghost for both 'scare' and 'scary'. So, is there a system that allows the memorisation of suffixes which is compatible with the link system?
Mathgeek007 wrote: Pluralization and past tense aren't really suffixes.
Blast.
BlastING.
Ing is a suffix.
BTW, I see you got that last one right.
How to remember them: Is it plural? Yes? PLURALIZE IT.

Easy enough.
I've fixed my error in the post. -ed does not indicate 'past tense'. -ed words can be used in the present perfect, in the future perfect, in the passive voice, as adjectives, etc. I'm not sure what you meant by 'Is it plural? Yes? PLURALIZE IT.' 
Edit Thanks Shadow! I scored 25 this time and it wouldn't have happened without the five letters tip!