If I () (am him)(请调整为合适的形式)(假如我是他), I would study hard.
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Seldom () (I play) (请调整为合适的形式和顺序)computer games.
I am () (always not) (请调整为合适的形式)confident.
It is necessary for us () (动词 master 的合适形式) (我们有必要掌握)at least one foreign language.
I feel it difficult () (动词 pass 的合适形式)(感觉很难通过) the exam.