Is said whole, with nothing composed onto it and takes no だ／です, so there are no forms to conjugate.
クーラーが効く
kuuraagakikuthe cooling works wellexpression
Example sentences1
夏でも、この部屋は十分にクーラーが効く。
natsu demo, kono heya wa juubun ni kuuraa ga kiku.
Even in summer, the cooling works well enough in this room. neutral