请帮我详细地分析一下句子成分,itisnouse……句型,谢谢~Itisnouseofferingthemanuallaborer,tiredoutwithahardweek'ssweatandeffort,thechanceofplayingagameoffootballorbaseballonSaturdayafternoon.其中,offe

　　请帮我详细地分析一下句子成分,itisnouse……句型,谢谢~

　　Itisnouseofferingthemanuallaborer,tiredoutwithahardweek'ssweatandeffort,thechanceofplayingagameoffootballorbaseballonSaturdayafternoon.

　　其中,offering……和thechance……在句中做什么成分?是offering“没有意义”?还是thechance“没有意义”?

　　Itisnouseinvitingthepoliticianortheprofessionalorbusinessman,whohasbeenworkingorworryingaboutseriousthingsforsixdays,toworkorworryabouttriflingthingsattheweekend.

　　还是不明白,inviting……和towork……是什么成分,到底是谁“没意义”?