I've heard some sentences which do not really make sense to me regarding the usage of adjectives.
ex) " It started a bit rocky" " I grew up bilingual"
Why isn't the fist sentence "It start a bit rockily or whatever the adverb forms of rocky and the second one " I grew up as a bilingual/ bilingually" ?
Other than these two, I've heard many other case where I think adjectives were used instead of adverbs. Is it grammatically correct or is it something like a contracted form?