Nouns
Verbs
Participles
Articles
Pronouns
100
This kind of Noun deals with ideas or concepts rather than real things.

What is an Abstract Noun?

OR

What are Abstract Nouns?

100

This form of the Verb exists independently of Conjugation and Tense.

What is the Infinitive?
100

This English word translates the Greek μετοχή and the Latin participium, from which we get our word "Participle," and which helps us to understand what it is that the Participle does.

What is "participation"?

100

This is the definite article in English.

What is "the"?

100
This feature of Indo-European Nouns defines what they are doing in a sentence and is still reflected in the spelling of English Pronouns.

What is Case?

200
This possible function of a Noun in a sentence relates to describing or qualifying the main Noun of a sentence. Hint: You want the bigger category, not the most common example.

What is the Predicate?

200
This is the only English Conjugation in which the spelling of the verb changes in the present tense.

What is the third person singular?

200

This Tense of the English language can use a Participle to emphasize the time at which something is taking place, or it can use a simple verb.

What is the Present tense?

200

This is the indefinite article in English.

What is "a" or "an"?

200

This feature of Indo-European Nouns has mostly disappeared from other English words, where it endures as a social construct, but is still used in the spelling of English Pronouns.

What is Gender?

OR

What is Grammatical Gender?

300
This kind of Noun undergoes the action of the Subject, though not directly.

What is the Indirect Object?

300
This tense of the English language describes something in the past that was ongoing or of indefinite conclusion.

What is the Imperfect?

300
The endings -ed and -en are used in many English participles of this simple tense. 

What is the Past tense?

300

This is the relative article in English.

What is "which"?

300
This form of the relative pronoun is only used as the Indirect and Direct Objects.

What is "Whom"?

400

This feature of Nouns used to change the way they were spelled, but now only functions as a description of our social constructions of different people, places, and things.

What is Gender?

400

This quality of Verbs describes their relationship to their Subject, and therefore the relationship between Subject and activity.

What is Voice?

400

These English tenses are capable of using participles.

What are all English tenses?

400

These are the demonstrative articles in English.

What are "this," "that," "these," and "those"?

400

This is the direct object form of the third person singular feminine pronoun.

What is "Her"?

500

This feature of Nouns used to be reflected in spelling, but is now mostly determined by word order, and tells us what a Noun is doing in a sentence.

What is Case?

500

This Mood of the English language deals with wishes, requests, hypotheticals, and intentions.

What is the Subjunctive?
500

This participle is especially used in relation to future tenses.

What is "going"?

500
This Indo-European language, influential on English, is not articulated, meaning that it lacks an article.

What is Latin?

500

This English pronoun, to Mr. Armstrong's profound fury, functions as the subject, indirect object, and direct object form for the second person singular AND the second person plural.

What is "You"?