It costs 800 yuan a month 对么

It costs 800 yuan a month 对么

可以。假如说完整的话，应该说：
It costs 800 yuan a month to do ......
cost的主语一定要是事物，例如：
The book cost me 12 yuan.
It cost me 1000 yuan to fly to Hainan.
The shirt will cost 50 yuan.
但是不可以说：
She costs 800 yuan a month.
应该说
She spends 800 yuan a month.
假如在某事物上花了多少钱，就应该说：
She spent 800 yuan on the bike.
或者She paid 800 yuan for the bike.(paid是pay的过去式）。
假如是花了多少时间则应该用“It takes somebody some time to do..."这个句型，例如：
It often takes me 10 minutes to walk to my school.
It took her 2 hours to do her homework.

It costs 800 yuan a month . 可以这样使用。

我用-来隔开单词的哦。not-more-than是不超过不多于的意思。而no-more-than是仅仅，不过的意思。根据题意，应该是：但我节省了不过八百块钱。

It costs 800 yuan a month 省略主语to me,可用在口语