I said "Kenapa kamu senyum" and I was wrong. Isn't it just alightly less formal.
Yes, that's right
Actually "Kenapa kamu senyum" will sounds more casual. In real life, we usually say "kenapa senyum-senyum" or just "kenapa senyum"
According to earlier exercises this should take an implied past form...why not so here?
"Kalian" not accepted