The weather is pretty sunny/bad these days.
It's pretty hot/cool these days.
He is having a bad mood these days.
The clouds are gathering pretty fastly, I think it's going to rain soon
5. 这三种是可以用的,但是推荐用第一种或第三种,然后就是 favorite 不拼做 favourite
favorite,favourite 都是正确的，，分别是美式英语，和英式英语的拼写规则呵呵。谢谢帮忙。建议你focus 在美式或英式，两者是比较接近，但是不建议混合用哦·~~