为什么是I often play football.而不是I often plays football.

为什么是I often play football.而不是I often plays football. I often play the piano. 括号了里应填什么 We often see the boy （ ）(play) football on the road.为什么是play 而不是plays I often play cards.改为否定句 I often play football.的问句 I often play the piano( ) home. I often play __ with brother. I often play ( ) the snow in winter. i often play the violin 句子结构 I often play football after school.(play football 划线提问) I often play sports after school.(拿play sport 提问) I often play sports. ( )I go shopping on the weekend. play过去式为什么是played? -I often play ping-pong.-Great!I can play ＿-I often play ping-pong.-Great!I can play ＿＿ you.A.atB.withC.and I often play __.(a soccer ,the soccer,soccer ) I often play basketball after school.(改为一般疑问句） I often watch them_____(play)soccer last year.急吖 I often play soccer改成否定句怎么改,为什么.