Transcribing informal text into formal language

The auxiliarysedang is similar to the continuous tense suffix in English.

Rewrite into formal Indonesian:
Ade lagi ngebantuin Papah di garasi.

Rewrite into formal Indonesian:
Kakak lagi ngebetulin sepedanya.

Rewrite into formal Indonesian:
Si Udin dateng pas gue baru aja nyampe di rumah.