Auxiliaries

An "auxiliary" in Japanese might be any of the following things:

1. jodoushi 助動詞
   Morphemes suffixed to verbs and adjectives in order to inflect them, like ~tai ～たい.
2. Auxiliary adjectives.
   Including suffixes of compound adjectives, and adjectives like ii いい,"good."
3. Auxiliary verbs.
   Including suffixes of compound verbs, and verbs like suru する, "to do."
4. hojo-yougen 補助用言
   An umbrella term for auxiliary words that go after the te-form of verbs: the hojo-doushi 補助動詞 and hojo-keiyoushi 補助形容詞.
5. keishiki-meishi 形式名詞
   Formal nouns, like koto こと.
6. rengo 連語
   "Collocations" are sometimes referred to as auxiliaries, like kamoshirenai かもしれない, "might be," which is composed by the particles ka か, mo も, and the verb shiru 知る in its negative potential form.