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Hi. How could we get a grasp of the notion (is that a notion? I don't know) of putting an adjective before what looks to be a gerund? Please see below.

Wrong/Right believing may do you bad/good.

Wrong/Right thinking may do you bad/good.

I think we can put an adverb in front of a gerund phrase (is the underlined part a gerund phrase anyway?) like the one below but not an adjective.

Wrongly believing he did the work may rob him of his rightful pay.
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Wrong/Right thinking may do you bad/good.-- 'Thinking' is a gerund-- that is, a noun-- therefore it can easily be modified by an adjective: good schooling, happy driving, bad timing.

Wrongly believing he did the work may rob him of his rightful pay.-- Here, perhaps the adverb modifies the whole clause ( 'Wrongly [believing he did the work]'). I can't really get my head around this one clearly, though.