Playing football is my hobby.这句话里有is,怎么才能区分此句是主谓宾结构还是主系表呢?

he is playing football .画线部分 football. he is playing football用playing football提问 my teacher is playing football对playing football提问 Let is playing football 还是Let is play football? playing football in the street is d football at she playing good is They ()football in the playground.a:playing.b:am playing.c:are playing.d:is playing. tom is playing --------his frend ,beety is playing -------piano ,jack is playing ------football Simon is playing football with some boys.对is playing football提问赶者睡觉啊 She is interested in playing football.(保持原句意思)She is _______ _______ playing football. Playing football is interesting He is playing football 怎样分主谓宾吖 Jack does well in playing football.Jack is _____Jack does well in playing football.Jack is _________ _________playing football. Jack likes playing football(保持句意不变) Jack is _______ _________ playing football My brother is playing football.改为否定句 My brother（ ）playing football. ( ) your friends playing football?No A.( ) your friends playing football?No A.areB.doC.is Look!The boys[ ]football together.A.playing B.are playing C.is playing选择 His hobby is playing football这里play为什么加ing Playing football is difficult.为什么用Play+ing ,