英语时态造句,现在进行时造句,五句

I am writing a composition now.
He is playing basketball on the playground.
The teacher is talking with the boy's parents.
The dog is yelling at the stranger.
They are having a discussion in the classroom.分别是啥意思？I am writing a composition now. 我正在写作文He is playing basketball on the playground.他在操场上打篮球The teacher is talking with the boy's parents. 老师正和这个男孩的父母谈话The dog is yelling at the stranger. 这条狗正冲着陌生人吼。They are having a discussion in the classroom 他们在教室进行讨论