帮我翻译下这些句子 拜托了

Writing at what you, write me at.
你在写什么，我在写信。
Playground has a lot of boys and girls, they are at playing basketball.
操场上有很多男生和女生，他们都在打篮球。
Students at apple picking? No, they picked at the banana.
学生们在摘苹果？不，他们在摘香蕉。

what are you writing?
im writing a letter.

there are many boys and girls in the playgroud ,playing the basketball.

are the students picking apples?
no,they are picking bananas