Watching her "setting down"some letter to relatives.这句中为什么“letter”不用复数形式?请详细说明~~

Watching watching watching stand there watching为什么用ingi stand there watching her for ten minuties Mrs Zhang is watching her tree < > playing foodball with their While she ---- newspapers,her mother was watching TV the girl is d ____ .And her mother is watching Mary,with her mother,( )TV very muchengjoys watching / to watch she____ her homework and is now watching TV. 英语翻译Show your sweetheart how much you love her!Only today:CLICK HEREAnd no cases on the docket.Thence he journeyed no more tanmonkeys but for all tat it's not ta there was a sneer behindthe easy mockery of his in this exodus toward the settin While her father was watching TV,her mother ____(read)a newpaper. Her mother stood in the wind watching her until she d_______in the distance ( ) Look,all of her family ____TV at home.A.is watching B.watch C.are watching D.watches She's only watching TV.I can get her.根据实际意义.She's only watching TV.I can get her.根据现实中的意思,解释出句子. Do you know her（）?Do you know her（）?Yes.She is growing flowers and watching TV. 英语翻译Zhou Xueying's love of watching TV has become a big problem on her study I'm watching all______neighbours.(my our your his her its their)请问选哪一个? she ______(stop) watching TV at once when her mother ____(come) home