Conjugated Form
noun
You know that 活用 means "conjugation" and that 〜形 means "form," so that means this is the conjugated form!
かつようけい
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
「立つ」の活用形が分かりません。
I don't know the conjugation forms of "tatsu".
色々な活用形を用いて、文を作って下さい。
Please make a sentence using various conjugation forms.
活用形は、いつもアプリで見てダブルチェックします。
I always double-check the conjugation forms in an app.