This is a very
fair, open question. You are free to concentrate on the poems by Mahon
you like best and on the issues which interest you. Don't forget to
give a personal response grounded in the text.
There are lots
of issues you may want to explore. Look at the themes and patterns which
emerge: solitary, forgotten figures; the ability to adopt different
personae and perspectives; past, present and future; violence; forgotten
victims of history and violence; Mahon's sense of place.
You may also wish
to compare and contrast the different voices which emerge in his poetry.
Don't forget that
this is a speech. Your knowledge and understanding of Mahon is most
important, but you should connect with your audience, and consider what
they might want to hear. This will give focus to your answer.