H5P Content 20879

In the word playfulness, what type of affix is -ful?

What does it mean to say that most roots in English are free morphemes?

Most roots in English can occur on their own as words, without any affix.
Most roots in English have flexible meanings, and can be used in more than one lexical category (noun, verb, etc.).
Most roots in English can appear in multiple positions in a sentence.
Most roots in English can appear with a variety of affixes, they aren't limited to just a few.

Which of the following English words are morphologically simple? (Or are likely to be morphologically simple for most current English users?)