If I was trying to build a garden shed, categorise each of the following as either "useful" or "not useful". A banana, a hammer, nails, screws, personal protective equipment, an assistant, wood, kitchen knife, spoon, ice, magnifying glass
The following items would be "useful" to help you build a garden shed: 
 
 A hammer
 Nails
 Screws
 Personal Protective Equipment 
 An assistant 
 Wood 
 
 The following items are "not useful" to help you build a garden shed: 
 
 Banana
 Kitchen knife 
 Spoon
 Ice 
 Magnifying glass