They often play basketball after school.为什么用play而不用playing,解释一下为什么用的是原型而没有加ING呢,

They often play football.问句 They often play the basketball.（改错） They often play basketball ( )wednesday afternoon they often play games改为一般疑问句 1.they often play m____ together. They often play football after school.对play football 提问 they often play football after school.对play football 提问 They often play sports often school的问句 ____do they often play football?They often play football (on the playground).对打括号部分提问 They play hard,they play often,and they play to win.分析一下语法啊.play是及物动词还是不及物动词 They often play soccer after school.对踢足球提问 主动变被动They often play football after school帮帮忙 they often play football after school 一般疑问句 they often play soccer on sunday改成否定句 they often play games for me after school . They often play games.[改为否定]求求哦 they often play football怎么变否定句 They often play football on Saturdays.(改为一般疑问句）