I think doing chores is not so difficult这句话对么?需要用否定前移么?

I think doing chores is not so difficult这句话对么?需要用否定前移么? I think that English is not so difficult as math.为什么不用否定转移? i think art is not so useful as science这句话正确吗 I think do chores is interesting 改错 Why I think of hope is always so difficult -Science is so difficult!-I think you should keep I think you are not worth doing so for me do you think 否定怎么回答?是用I think not .还是 I don't think so. ,is ok,I also think so, 这句话是什么iysi? i think study english is very difficult.这句话有问题么?快来救命啊, I think studying English is not difficult I think ______ ___ difficult,i,chinese,think,is