Unit 6 A charity walkI. Phrasestrain for a charity walkfind two more people=find another two peopleneed some more foodneed to do sth/don’t need to do sth.(need做行为动词)need do sth./ needn’t do sth.(need做情态动词)an elderly persondeaf people (people是集合名词,还有police,clothes)help them cross the road=help them walk across the road(注意cross和across的用法)one of Hong Kong’s biggest fund-raising eventsbe known as…raise money for helping poor people=rai..