There are conjugation forms, and one of them is the five-stage conjugation.
There are pentadic conjugations, which are conjugated with each step of the syllabic chart "a-i-u-e-o" at the end of a word. (The most common verb conjugation is the five-step conjugation.
The five conjugations are the changes of the five conjugations: preemptive, continuous, terminating, linking, hypothetical, and imperative.
Take the example of 「合う」 in the link.
- The non sequential form (preceding the auxiliary verb "ない", "う", "れる", etc.)
- 「合わ(wa)ない」 The sound of "a" ...... ア段
- 「合お(o)う」 The sound of "o" ......... オ段
- Adjunctive form (preceding the auxiliary verbs "ます," "た," and "たい," etc.) Abortive forms (forms that are cut off by ","). The form preceding the auxiliary verb "て", "たり", "ながら", etc.)
- 「合い(i)ます」 The sound of "i" ............ イ段
- Ending form (a form of saying off. The form preceding the auxiliary verb "まい" or "らしい". The form preceding the auxiliary verb "と," "から," "けれど," etc.)
- 「合う(u)」 The sound of "u" ............ ウ段
- Adnominal form (preceding a noun or pronoun)
- 「合う(u)とき」 The sound of "u" ............ u-dan
- Hypothetical form (preceding the particle "ば")
- 「合え(e)ば」 The sound of "e" ......... エ段
- Imperative (the form of commanding and saying a sentence out loud)
- 「合え(e)」 The sound of "e" ............ エ段
It goes like this.