i feel it hard to keep up with my classmates的句子结构 it后不应该有is吗

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i feel it hard to keep up with my classmates的句子结构 it后不应该有is吗

i feel(主谓) it (形式宾语)hard (宾补)to keep up with my classmates(不定式作真正宾语)
i feel (主谓)it 【is】hard to keep up with my classmates(宾语从句)
以上两句都对,意思一样.