I tried to:
- use the words they have come across in Year 1 (e.g. hopeless in Year 1 Unit 1) and words they will come across in Year 3 (e.g. endless, speechless)
- use the -less words as collocations (e.g. endless possibilities)
- draw a link between in-/im- prefixes and the -less suffix
- draw a link to their Primary School Leaving Examination Science days. I used to spend a lot of time on the concept of friction. Frictionless could be a word to stretch the higher progress students.