This is taken from Manhattan SC Guide
Often, the GMAT provides two grammatically correct phrasings. For instance, one phrasing might be
[Adjective + Adjective + Noun], in which the two adjectives both modify the noun. The other phrasing
would be [Adverb + Adjective + Noun], in which the adverb modifies the adjective, which in turn
modifies the noun. These two phrasings do not mean the same thing. Pick the phrasing that reflects
the authors intent.
Wrong: James Joyce is Max's SUPPOSEDLY Irish ancestor.
Right: James Joyce is Max's SUPPOSED Irish ancestor.James Joyce may or may not be Max’s ancestor, but James Joyce was certainly Irish. Thus, we want the
adjective supposed, so that we can modify the noun ancestor.
Wrong: Max's grandmother is his SUPPOSED Irish ancestor.
Right: Max's grandmother is his SUPPOSEDLY Irish ancestor.What is in question here is whether Max’s grandmother was Irish, not whether she is Maxs ancestor.
Thus, we want the adverb supposedly, so that we can modify the adjective Irish.
My doubt is how do we identify what is the author's intent in the 2 questions mentioned above.
Both questions seem identical to me,yet they have different answers and explanation is intent.
Can someone please explain