Entry record from Fricke (2013): Hewa
'ia
(1) dem. that.itu.
(2) prep. preposition for location, origin or goal.di; ke; dari.
(3) adv. there.di situ.
'ia gu
• conj. after that.setelah itu.
'ia na
• conj. therefore.oleh sebab itu; sehingga.
'ia nan
• adv. there.di situ.
'ia wawa nan
• adv. there.di situ.
Note: Probably the adverb 'ia' (=there) only has scope over part of the sentences whereas expressions like ''ia nan' or ''ia wawa nan' (=there) function as sentence adverbs.