Huh

え

e

(to express amusement or subtle surprise)

え

e

(expressing doubt or confusion)

え

e

(to indicate that one didn't hear)

えっ

e'

(to express amusement or subtle surprise)

えっ

e'

(to indicate that one didn't hear)

か

ka

(tag question)

ぞ

zo

(expressing doubt or confusion)

な

na

(to reinforce a question)

ね

ne

(to reinforce a question)

ね

ne

(tag question)

へえ

hē

(expressing doubt or confusion)

よ

yo

(expressing doubt or confusion)