Need + ing

Need + ing

We can use this form when we want to talk about something that is necessary for someone to do. We don't have to say who is going to do it. For example, when the instructor said "Dusty needs untacking" she meant "The horse needs to be untacked by you, Ellie".

This is a passive structure where the usual subject + verb + objectform changes to object + need + verb+ing.

We form this structure with:

object    need / needs    verb+ing

The horse        needs    untacking

The house        needs    tidying

The stables        need     mucking out

These letters       need     posting

We form the negative with: 

object don't / doesn't need verb + ing

The car    doesn't need     washing

The plant    doesn't need    watering

The stables    don't need    painting

The horses    don't need    feeding

출처: http://www.bbc.co.uk/worldservice/learningenglish/flatmates/episode121/languagepoint.shtml

참고 자료: https://www.economist.com/news/business/21727908-unilever-worlds-biggest-experiment-corporate-do-gooding-parable-st-paul