I'm going to have a picnic this afternoon改为否定句

问题描述:

I'm going to have a picnic this afternoon
改为否定句

i'm not going to have a picnic this afternoon.

I won't have a picnic this afternoon.

i'm not going to have a picnic this afternoon.
或者
i won't go to have a picnic this afternoon

I am not going to have a picnic this afternoon