today I am still study hard on maths 这句话有错吗

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today I am still study hard on maths 这句话有错吗
today I am still study hard on maths 这句话有错吗

today I am still study hard on maths 这句话有错吗
Today,i am still working hard on solving maths problems 会不会好一点

去除句子的枝叶,I am study hard on maths。be动词用法不当,一般说:I study hard on maths。去掉be动词am