i don't believe so还是i believe bot

i don't believe so还是i believe bot
有没有 i think not
有i guess not,不能说i don't guess so吗?
think,guess,hope,believe 表示不这样认为的时候有那些搭配是对的哦!
有这样一道题：
--the boys are not doing a good job at all,are they?
---_________.
a.i guess notb.i don't guess so答案是i guess not.那就说明i don't guess so是错的了哦,那么hope呢?但愿如此是i hope so.不希望这样是i hope not呢还是i don't hope so.或者都可以呢?我觉得好像应该是i hope not.那么believe和think哪?是两种都可以吗?