N5 — outside your level filter
write + it's that…
kaku no
it's that…; is it that…? — the plain-style explanatory ending
ちょっと頭が痛いの。
chotto atama ga itai no.
It's just that I have a bit of a headache. casual
どこ行くの？
doko iku no?
Where are you off to? casual