把所给的句子变成：肯定句，否定句，一般疑问句，肯定回答，否定回答。

首先这里的每个句子都是肯定句
否定句形式：
注：第一句话有问题
We didn`t plant trees last weekend.
I wasn`t at the zoo yesterday
I didn`t visit my uncle yesterday
John didn`t play computer games last night.
We were not busy last week
一般疑问句 及其回答：
Did you plant trees last weekend？Yes，we did./ No, we didn`t
Were you at the zoo yesterday?Yes,I was. /No,I wasn`t.
Did you visit your uncle yesterday?Yes,I did/No,I didn`t.
Did John play computer games last night?Yes,he did/No,he didn`t.
Were you busy last week? Yes,we were./No,we wasn`t.