ある, 有る, 在る
Conjugated: あれば
Godan verb, Intransitive, See 居る・いる・1, Usually in kana, usu. of inanimate objects
1. to be, to exist, to live
2. to have
3. to be located
4. to be equipped with
5. to happen, to come about
悪いけどほかに用事があるの。
こそ
Particle, emphasizes preceding word or phrase
1. it is ... that ..., precisely, in particular, definitely, for sure, only (when, after, because, etc.)
as こそあれ, こそすれ, こそするが, etc.
2. although, while, it is the case that ... but
after conditional -ba form of verb
3. it is precisely because ... that ..., only because ...
formal or literary term, after -nai stem of verb + ば
4. not at all, not in the slightest, absolutely not, never
辛抱こそ大事なんだ。
くっそ, 苦蘇, こそ, クッソ, コソ
Usually in kana
kousso (African flowering plant, Hagenia abyssinica), kosso, cusso, koso, brayera