Mary usually brushes his teeth after （getting） up.为什么getting up要加ing形式?

Mary usually brushes his teeth after （getting） up.为什么getting up要加ing形式? Are those dirty brushes Mary's brushes?(改为陈述句) Yang Ling usually brushes her teeth after she gets 提问：whose brushes are these?回答：_______ brushes are Mary's.空格处填Those还是These?为什么? John usually brushes his teeth before he goes to bed.（用What对{brushes his teeth提问}） He usually brushes teeth at 6;30 every morn-ing(对画线句子提问是 brushes teeth ) He usually brushes teeth at 6;30 every morn-ing(对画线句子提问是 brushes teeth ) Mary usually has____breakfast at home john usually brushes his teeth before he goes to bed.的问句 Guo yue usually brushes his teeth in the evening.（改为一般疑问句）. John usually brushes his teeth before he goes to bed.(brushes his teeth画线,用What对画线部分提问） Mary usually has lunch at school=? Everybody knows Mary ______sweets.A.usually like B.usually likes C.like usually D.likes usually what does Bill usually do after he gets up?-He____his teethA brush B brushes C to brush D brushing brushes her brushes ones he brushes his teeth at about 7 o’clock（对brushes his teeth提问）wang ming‘s family has one shower.（对one提问）they usually take the number 20 bus to work（改为一般疑问句） Mary usually does some _____(read) in the morning.