If you're still uncertain, my current understanding of the EAL requirements, (keeping in mind that I did mainstream English so your teacher's recommendations should still probably take precedence here,) is that the intro/concl. aren't required, but making your first sentence sound a little bit 'introduction-y' and your last sentence sound a little bit 'conclusion-y' is all you need.
You can put them in separate paragraphs if you really want, but it's fine to just have three body paragraphs with one sentence at the start like 'The author ____ contends in his piece entitled ____ that...' and then one at the end like 'Therefore the author intends to elicit ____ from readers in order to imply that...'
Anyone else who's heard differently is welcome to jump in though, since I'm just basing this on what I've heard from about three or four teachers and there might be other alternatives of which I'm not aware.