He worried that he would fail the exam.

他担心会考试不及格。

Her child has a bad cough and it rather worries her.

孩子咳嗽得很严重，令她十分担忧。

The noise never seems to worry her.

这噪音似乎从未让她感到厌烦。

Don’t keep worrying him with a lot of silly questions.

别老用这些愚蠢的问题烦他。

You have no cause / reason to worry.

你没有理由担心。

Frank doesn’t worry about making mistakes.

弗兰克不担心犯错。

She lost weight because of all the worry about her son’s illness.

她因为担心儿子的病情而消瘦了。