请帮我分析下面的句子forexample,sometimeswhenheleavestheapartmenttoplayfootball,Amandaandherfriend,sharon,aresittingonthesofa,talking.特别是句中逗号的作用和为什么用aresitting不用sitting

Question

请帮我分析下面的句子
for example,sometimes when he leaves the apartment to play football,Amanda and her friend,sharon,are sitting onthe sofa,talking.特别是句中逗号的作用 和为什么用are sitting 不用sitting

Answer 1

For example,sometimes when he leaves the apartment to play football,Amanda and her friend,Sharon,are sitting on the sofa,talking.
译：比方说,有时他离开寓所踢球去,这时阿曼达和她好姊妹（或：闺蜜）莎朗就（一直）坐沙发上,谈天说地（或：无所不谈）.
说明：
1.此句用了不少拆分式（如同位语Sharon）,以逗号间隔；或以伴随状语方式（talking之于sitting）间断
2.are sitting,在他出去踢球这段期间,俩女生一直坐沙发,持续动作,故予现在进行时,当然用一般现在时sit亦可,但单用sitting语法错误
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