The challenge I had while learning about parts of speech is to differentiate between some possessive adjectives and possessive pronouns that are shared between both types. i.e., his and its.
I understand that possessive pronouns, like all pronouns, take the place of nouns. This should make telling the difference between both types a little more clear, but I have to take a long pause and dissect the sentence to tell the difference.
Another challenge is to remember the different possible categories of some parts of speech, like:
- The three types of conjunctions (coordinating, subordinating, and correlative),
- The many types of nouns (abstract vs concrete, plural vs singular, common vs proper ...), and
- comparative and superlative adjectives.