N5 — outside your level filter
Is said whole, with nothing composed onto it and takes no だ／です, so there are no forms to conjugate.
熱がある
netsugaaruhave a feverN5expression
Example sentences2
子どもに熱があるので、病院に行きます。
kodomo ni netsu ga aru node, byouin ni ikimasu.
My child has a fever, so I'm going to the hospital. neutral
なんか熱があるみたい。
nanka netsu ga aru mitai.
I think I've got a fever or something. casual