This HyperPoet makes it easy to dynamically create fill-in-the-blanks grammar exercises. It will replace all occurrences of the specified part of speech (like "verb" or "noun") in the provided text with boxes for the user to fill in an answer, which can be checked by clicking on the question mark. The user has the option of providing the base form of the word (like the infinitive of verbs or the singular of nouns, etc.).