1.they are (正在练习打篮球）要怎么填,为什么?2.learning English well need (许多练习）要填什么
问题描述：
1.they are (正在练习打篮球）要怎么填,为什么?2.learning English well need (许多练习）要填什么
答
They are practicing playing basketball.现在进行时
Learning English will need lots of practice.practice 不可数为什么practice 要加ingare doing 是现在进行时的结构啊