Which of the following are inflectional morphemes?

-s

-es

-ness

-ed

-ing

-est

-er

-en

When we say inflectional morphemes, these are morphemes that are grammatical markers that indicate tense, number, possession, or comparison and these include - s, - es, 's, - ed, est, er, - ing, and - en. Inflectional morphemes in English include the bound morphemes. Hope this is the answer that you are looking for. Have a great day!