[etni] spelling mistakes of LD pupils

I hope someone with professional knowledge can answer this. Opinions, my staff 
and I have, it's the ruling we're looking for.
Are LD students, those who aren't penalized for spelling mistakes, expected to 
learn spelling rules for verbs; such as, the rules of adding ing, es, s etc. ?

Thank you,
Katzir Jr. HIgh, Rehovot

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