有効に
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Add 『に』 (ni, adverbial) after the base form → 『有効に』 (yūkō ni).
Theme
In a university study group, User and their friend Aya talk about preparing for an upcoming exam and sharing study techniques.
有効
ゆうこう
valid / effectual
Advanced ExpansionAbstract Concepts
Memory Hook
Imagine a 'valid' ticket that lets you enter a concert. You say, 'You can enter!' — it sounds like 『有効』 (yūkō, 'valid'). 'You can' → 有効 (yūkō, 'valid').
Cultural Note
In Japan, 『有効』 (yūkō, 'valid') is often used on tickets, coupons, or documents to indicate they are still usable. For example, 『有効期限』 (yūkō kigen, 'expiration date') is a common term on food packaging or event tickets.
Forms
Adverbial: 有効にAdd 『に』 (ni, adverbial) after the base form → 『有効に』 (yūkō ni).
Base: 有効Base na-adjective form. Used to describe something that is legally or functionally valid, such as a document or method. Requires 『な』 (na) when modifying a noun, e.g., 『有効な方法』 (yūkō na hōhō, 'effective method').
Negative: 有効ではないAdd 『ではない』 (de wa nai, 'is not') after the base form → 『有効ではない』 (yūkō de wa nai).
Past: 有効だったAdd 『だった』 (datta, past) after the base form → 『有効だった』 (yūkō datta).
Comparative: より有効Comparative formed with modifier 『より』 (yori, 'more than') + base adjective.
Superlative: 一番有効Superlative formed with 『一番』 (ichiban, 'number one / Most') + base adjective.