Roberts - it should be Robert's since he possesses the thoughts that are wandering. As per sentence, this is the only plural and possessive error that's in it. If you also read the sentence carefully, the first two words don't seem appropriate at all.
Roberts - it should be Robert's since he possesses the thoughts that are wandering. As per sentence, this is the only plural and possessive error that's in it. If you also read the sentence carefully, the first two words don't seem appropriate at all.
