<p>1) Because they painted scenes of life as ordinary people lived it, rather than scenes from myths, many nineteenth-century American artists differed from earlier times. </p>
<p>What should the phrase be in place of this?</p>
<p>2) ...is not necessary in the enjoyment of medieval literature.</p>
<p>Is this a idiom error? should it be "to"?</p>
<p>3) The exchange between the teacher and the student promotes learning far different from that which results as the student listens but does not participate.</p>
<p>Idiom error also? results "from"?</p>
<p>1) Because they painted scenes of life as ordinary people lived it, rather than scenes from myths, many nineteenth-century American artists differed from earlier times.
I think it should be "from earlier artists" because the sentence is talking about American artists, not the times.</p>
<p>2) ...is not necessary in the enjoyment of medieval literature.
[...]not necessary for the enjoyment of [...]?</p>
<p>The exchange between the teacher and the student promotes learning far different from that which results as the student listens but does not participate.
I think it should be "when".</p>