请问at,for,to,the,on,in等词在表示什么的情况下用的???只要这几个词...答:she offered to help him in the housekeeping when i am not here.她提出,我不在家时她可以帮助他料理家务。2. be +形容词+ in。in表示“在某些方面或穿着”:be active in活跃于,be absorbed in专心致志, be busy in忙碌, be born in出生于,be concerned in牵涉, be clothed in穿着, be ...