Soon, I began to worry about my study.

很快，我开始担心自己的学习。

youdao

I began to worry as he still needed his parents.

我开始担心，因为它还需要它的父母。

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I began to worry about her, as at that time a park full of strangers was not a good place for small kids to play alone.

我开始担心她，因为当时公园里满是陌生人，小孩子一个人玩耍并不安全。

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