为什么要用stay at home?

为什么要用stay at home? stay at home为什么要加at? would+stay+at+home为什么用would home是副词,at是介词,为什么用stay at home shall we stay at home watching TV tonight?为什么要用watching而不是wa I am stay at home 为什么错误 I usually stay home at night.stay home 中home前面为什么不用加at? He must stay at home.句中的stay要加s吗?为什么? stay at home stay in the house 为什么两者介词用的不一样?如题 some people like to stay at home,home为什么用单数? 英语翻译要用stay at home来造句 Stay at home tomorrow if it is rains.为什么不能说成是Stay at home to