'A confident person speaks a little stronger, stands a little taller, and looks a little bolder'.
I read the sentence in the book Instant Voice Training.
In this sentencen, both the verb speaks and stands are modified by an adjective, stronger and taller. What I have found on google is that an adjective can only follow a linking verb as complement of the subject. But in this case, the only linking verb is look, both speak and stand are action verb. So what is the grammatical facts of it?
I assume that there are ellipses. It probably should be speaks in a way that is a little stronger , stands in a way that is a little taller. Is that right?