看这句英语有无错误！很简单
声明 小说素材，内容虚构，如有雷同，纯属巧合！
I think that we will have a good time in these days
我认为在那几天我们会很开心
I think we will be very happy in these day。应该改为I think we will be very happy in these days。
意思为：我想我们在这些天里一定会很幸福的
I think that we will have a good time in these days
我认为在那几天我们会很开心
I think we will be very happy in these day。应该改为I think we will be very happy in these days。
意思为：我想我们在这些天里一定会很幸福的