Spelling and Grammar
Parts of speech (easy)
Past, present, and future tenses
Types of nouns
Concrete/abstract, common/proper, countable/uncountable...
The baddest or the worst? Most comfortable or comfortablest?
Subject, object, and reflexive pronoun
Me or I? They or them?
Adjective or adverb (easy)
Quick or quickly? Good-looking or well-looking?