Subject + 担心 + Clause
The verb 担心 (dānxīn) means to worry about or be concerned about something. It can be followed by a clause describing what one is worried about. For example, 她担心是人找到了这里 means "she worried that someone had found this place."
妈妈总是担心我一个人在外面吃不好。
Māma zǒngshì dānxīn wǒ yī gè rén zài wàimiàn chī bù hǎo.
Mom always worries that I don't eat well when I'm away from home.
别担心,手术很成功,他很快就能出院。
Bié dānxīn, shǒushù hěn chénggōng, tā hěn kuài jiù néng chūyuàn.
Don't worry, the surgery was very successful; he'll be discharged soon.
她担心明天的面试会表现不好。
Tā dānxīn míngtiān de miànshì huì biǎoxiàn bù hǎo.
She's worried that she won't perform well in tomorrow's interview.